# Camera Accessories & Parts

Camera accessories split into unrelated tool families: support, optics, lighting, storage, power, cleaning, remote control, and lens adapters. Each family has its own expert spec. A buyer's camera mount and an accessory's compatibility standard, such as UHS speed class, CIPA battery rating, CFexpress type, or lens flange distance, decide whether it works at all before quality differences matter.

## How it works

A tripod or monopod holds the camera still so a slower shutter speed does not blur the shot; its leg material and head joint decide how rigid and adjustable that hold is. A filter sits in front of the lens and changes the light reaching the sensor: a polarizer cuts reflected glare, a neutral-density filter reduces brightness by a measured number of stops, and a UV filter mainly protects the glass. A flash or continuous light adds light the scene lacks. Memory cards and batteries store the image data and the power the camera draws, each rated by a published speed or capacity standard. A lens adapter changes which lenses mount on a body, limited by how far the lens sits from the sensor on each system. Cleaning tools and remote triggers keep the glass clear and the shutter firing without shaking the camera.

## How an expert narrows the choice

```mermaid
timeline
  section 1 · Accessory family
    tripod_or_support : ask Support type, Leg material, Head type, Leg lock type : skip Filter type, Flash mount & control, Card format, Battery type, Adapter type, Cleaning method, Remote connection
    lens_filter : ask Filter type, Thread size, ND strength (stops) : skip Support type, Flash mount & control, Card format, Battery type, Adapter type, Cleaning method, Remote connection
    flash_or_lighting : ask Flash mount & control, Flash power class : skip Support type, Filter type, Card format, Battery type, Adapter type, Cleaning method, Remote connection
    memory_card : ask Card format, Speed rating : skip Support type, Filter type, Flash mount & control, Battery type, Adapter type, Cleaning method, Remote connection
    battery_or_charger : ask Battery type, OEM or third-party, Safety/shipping certification : skip Support type, Filter type, Flash mount & control, Card format, Adapter type, Cleaning method, Remote connection
    cleaning_kit : ask Cleaning method : skip Support type, Filter type, Flash mount & control, Card format, Battery type, Adapter type, Remote connection
    remote_trigger : ask Remote connection : skip Support type, Filter type, Flash mount & control, Card format, Battery type, Adapter type, Cleaning method
    lens_adapter : ask Adapter type, Light gain or loss : skip Support type, Filter type, Flash mount & control, Card format, Battery type, Cleaning method, Remote connection
  section 2 · Camera mount or brand
    Which camera mount or brand do you shoot?
```

1. **Accessory family.** Support, filter, lighting, storage, power, cleaning, trigger, or adapter?
   It decides which spec set matters next: a tripod's load and head, a filter's optical effect, a flash's power and mount, a card's speed class, a battery's rating, an adapter's mount pair, a cleaning tool's method, or a remote's connection.
   If tripod_or_support: ask Support type, Leg material, Head type, Leg lock type; skip Filter type, Flash mount & control, Card format, Battery type, Adapter type, Cleaning method, Remote connection.
   If lens_filter: ask Filter type, Thread size, ND strength (stops); skip Support type, Flash mount & control, Card format, Battery type, Adapter type, Cleaning method, Remote connection.
   If flash_or_lighting: ask Flash mount & control, Flash power class; skip Support type, Filter type, Card format, Battery type, Adapter type, Cleaning method, Remote connection.
   If memory_card: ask Card format, Speed rating; skip Support type, Filter type, Flash mount & control, Battery type, Adapter type, Cleaning method, Remote connection.
   If battery_or_charger: ask Battery type, OEM or third-party, Safety/shipping certification; skip Support type, Filter type, Flash mount & control, Card format, Adapter type, Cleaning method, Remote connection.
   If cleaning_kit: ask Cleaning method; skip Support type, Filter type, Flash mount & control, Card format, Battery type, Adapter type, Remote connection.
   If remote_trigger: ask Remote connection; skip Support type, Filter type, Flash mount & control, Card format, Battery type, Adapter type, Cleaning method.
   If lens_adapter: ask Adapter type, Light gain or loss; skip Support type, Filter type, Flash mount & control, Card format, Battery type, Cleaning method, Remote connection.
   Skip if already known: a query naming the specific accessory, like 'ND filter' or 'memory card', an earlier answer naming a product type in this family.

2. **Camera mount or brand.** Which camera mount or brand do you shoot?
   Lens adapters, speedlight hot-shoe protocols, and proprietary batteries are built for one system; knowing the mount first rules out whole shelves of incompatible accessories before any other spec is compared.
   Skip if already known: a query naming a camera brand or mount, like 'Sony E' or 'Canon RF', an earlier answer naming the camera body owned.

## What to surface

### Accessory family

Which family of camera add-on the product belongs to: support, optics, lighting, storage, power, cleaning, remote control, or lens adapters. It decides which spec set matters next: a tripod's load and head, a filter's optical effect, a flash's power and mount, a card's speed class, a battery's rating, an adapter's mount pair, a cleaning tool's method, or a remote's connection. Asking this first avoids asking about ball heads on a memory card. [1] [7]

Values: tripod_or_support, lens_filter, flash_or_lighting, memory_card, battery_or_charger, cleaning_kit, remote_trigger, lens_adapter.
Question to ask: Support, filter, lighting, storage, power, cleaning, trigger, or adapter?

Used as: top-level split, filter. Data: derived from listing fields, backfill cost low. Look for it as: Derive from the product title and category breadcrumb ('tripod', 'ND filter', 'speedlight', 'SD card', 'battery', 'sensor cleaning kit', 'remote shutter release', 'lens mount adapter').
Title and category keyword match covers nearly every listing; this is the leaf's own catch-all grouping of otherwise unrelated product types.

### Camera mount or brand

The lens mount and brand system the buyer's camera body uses, such as Sony E, Canon RF or EF, Nikon Z or F, Fujifilm X, L-mount, Micro Four Thirds, or Pentax K. Lens mount adapters, speedlight hot-shoe protocols, and proprietary batteries are built for one camera system. Knowing the mount before anything else rules out whole shelves of incompatible accessories, especially for adapters, where a mirrorless body's short flange distance can host lenses from almost any older system but a DSLR's longer flange distance mostly cannot host anything else. [14]

Values: sony_e, canon_rf, canon_ef, nikon_z, nikon_f, fujifilm_x, l_mount, micro_four_thirds, pentax_k, other_or_unsure.
Question to ask: Which camera mount or brand do you shoot?

Used as: top-level split, filter. Data: derived from listing fields, backfill cost medium. Look for it as: Usually stated as 'for Sony', 'Canon RF mount', etc. on flash, adapter and battery listings; rarely present on filter, card, tripod or cleaning-kit listings since those are mount-agnostic.
Title keyword match works when the listing names a mount; otherwise it must be inferred from the specific battery or flash model number against a lookup table.

### Card format

The physical card standard: SD/SDHC/SDXC, microSD, CFexpress Type A, CFexpress Type B, or CFast. A card that is the wrong physical format or electrical interface for the camera's slot will not fit or will not be read at all; CFexpress Type B is the fastest common format but Sony's mirrorless bodies use the smaller, slower Type A instead, and almost no device yet takes Type C. [7] [9] [10]

Values: sd_sdhc_sdxc, microsd, cfexpress_type_a, cfexpress_type_b, cfast.
Question to ask: SD card, microSD, or CFexpress?

Used as: top-level split, filter. Data: on the listing, backfill cost low. Look for it as: Always printed on the card and in the title ('SanDisk Extreme PRO SDXC', 'CFexpress Type B').
Title keyword match covers essentially every listing.

### Support type

Whether the support is a full tripod, a single-leg monopod, or a handheld gimbal stabilizer. A tripod frees both hands and holds a pose indefinitely; a monopod is faster to set up and move but the photographer still braces it; a gimbal stabilizer smooths handheld video motion instead of holding a static position. [1]

Values: tripod, monopod, gimbal_stabilizer.
Question to ask: A full tripod, a monopod, or a handheld gimbal?

Used as: filter, shown on the card. Data: on the listing, backfill cost low. Look for it as: Almost always in the title ('Travel Tripod', 'Monopod', '3-Axis Gimbal Stabilizer').
Title keyword match covers nearly every listing.

### Filter type

What optical effect the filter has: UV/protection, circular polarizer, fixed or variable neutral-density, graduated ND, color correction, or close-up/macro. Each type solves a different problem: UV mainly protects the front element, a polarizer cuts reflections and deepens skies, ND cuts brightness for slower shutter speeds or wider apertures in bright light, and graduated ND balances a bright sky against a darker foreground. [2] [3] [5]

Values: uv_protection, circular_polarizer, neutral_density_fixed, neutral_density_variable, graduated_neutral_density, color_correction, close_up_macro.
Question to ask: Protect the lens, cut glare, or darken it for a slower shutter?

Used as: top-level split, filter. Data: on the listing, backfill cost low. Look for it as: Almost always in the title ('UV Filter', 'Circular Polarizer CPL', 'ND1000 Filter', 'Variable ND2-ND400').
Title keyword match on the printed filter code (UV, CPL, ND plus a number).

### Battery type

What kind of battery it is: a camera-brand-proprietary lithium-ion pack, a standard-size lithium-ion cell, or AA-size NiMH rechargeables used in some grips and flashes. A proprietary lithium-ion pack only fits the camera models it was designed for and is rated against the CIPA standard battery-life test, so CIPA shot counts are only comparable between packs tested the same way; AA NiMH cells trade capacity for being replaceable anywhere. [13] [11] [12]

Values: proprietary_lithium_ion, standard_lithium_ion_cell, aa_nimh.
Question to ask: A camera-specific battery pack, or standard AA cells?

Used as: top-level split, filter. Data: on the listing, backfill cost low. Look for it as: Title usually names the exact pack model ('LP-E6NH Battery', 'NP-FZ100 Battery') or 'AA Battery Grip'.
Title keyword match against the camera's own battery model number.

### Leg material

What the tripod or monopod's legs are made of: aluminum, carbon fiber, or another material such as steel or plastic. Carbon fiber is lighter and damps vibration better for the same rigidity, which matters for travel and long lenses, but costs noticeably more than the aluminum tubing used on most sub-$50 tripods. [1]

Values: aluminum, carbon_fiber, steel_or_other.
Question to ask: Aluminum or carbon fiber legs?

Used as: filter, shown on the card. Data: on the listing, backfill cost low. Look for it as: Almost always in the title ('Carbon Fiber Tripod', 'Aluminum Tripod').
Title keyword match; default to aluminum when unstated, since it is the cheaper, more common material.
Chart: position on a weight-vs-price axis, carbon fiber lightest and most expensive.

### Thread size

The screw-in filter's thread diameter in millimeters, which must match the lens's own filter thread (or a step-up/step-down ring must bridge the two). A filter that does not match the lens's printed diameter (shown after the ⌀ symbol on the lens barrel) simply will not thread on; standard sizes run from about 37mm to 82mm in fixed steps, so a mismatched size needs an adapter ring rather than the wrong filter working loosely. [4]

Values: under_52mm, 52_to_58mm, 62_to_67mm, 72_to_77mm, 82mm_and_up, variable_or_magnetic_system.
Question to ask: What filter thread size does your lens take?

Used as: filter, shown on the card. Data: on the listing, backfill cost low. Look for it as: Stated as a number in millimeters in the title or spec table ('58mm UV Filter').
Title keyword match on the mm figure; bucket into the size ranges above.

### Cleaning method

How the kit cleans the lens or sensor: dry air blower or brush, wet swab with cleaning fluid, microfiber cloth only, or a sensor loupe for inspecting dust rather than removing it. A dry blower or brush is the safe first step for loose dust and will not fix a stuck smear or oil spot; a wet swab and fluid are needed for a sensor smear but risk streaking or scratching if used carelessly; a sensor loupe lights and magnifies the sensor so the photographer can see what is actually there before choosing a method. [18] [19]

Values: dry_air_or_brush, wet_swab_and_fluid, microfiber_cloth_only, sensor_loupe_inspection.
Question to ask: Dry dust removal, a wet sensor swab, or just a lens cloth?

Used as: top-level split, filter. Data: on the listing, backfill cost low. Look for it as: Named directly in the title ('Sensor Cleaning Swab Kit', 'Air Blower', 'Microfiber Lens Cloth', 'Sensor Loupe').
Title keyword match covers nearly every listing.

### Remote connection

How the remote fires the shutter: a mechanical cable release, a wired electronic remote, infrared, radio/wireless, or a programmable intervalometer that fires on a timed schedule. A simple cable or wired remote avoids the camera shake of pressing the shutter button by hand and can lock the shutter open for a bulb exposure; an intervalometer adds the ability to fire automatically at set intervals for time-lapse sequences, which a plain remote cannot do. [17] [16]

Values: mechanical_cable_release, wired_electronic_remote, infrared_remote, radio_wireless_remote, programmable_intervalometer.
Question to ask: A simple remote button, or a programmable time-lapse intervalometer?

Used as: top-level split, filter. Data: on the listing, backfill cost low. Look for it as: Named in the title ('Wireless Remote Shutter Release', 'Intervalometer Timer Remote').
Title keyword match; 'intervalometer' or 'timer' in the title signals the programmable variant.

### Head type

The joint connecting the camera to the tripod: a ball head (one ball joint for all axes), a 3-way pan-tilt head (separate controls per axis), or a fluid/gimbal video head. A ball head allows fast, free-flowing recomposition from a single lock; a pan-tilt head gives precise, independent control of one axis at a time, which suits architecture and panoramas; a fluid head gives smooth, damped video pans instead of either. [1]

Values: ball_head, pan_tilt_head, fluid_or_video_head, fixed_or_none.
Question to ask: A ball head, a pan-tilt head, or a video fluid head?

Used as: filter, shown on the card. Data: on the listing, backfill cost low. Look for it as: Usually named in the title or bullet points ('Ball Head Tripod', '3-Way Pan-Tilt Head', 'Fluid Video Head').
Title keyword match; most budget tripods ship with a fixed ball head described in the same listing.

### Flash mount & control

How the flash connects to and is controlled by the camera: brand-matched TTL hot-shoe, manual-only hot-shoe, wireless radio receiver/trigger, or a continuous LED panel instead of a flash. A TTL hot-shoe flash reads the camera's own metering for automatic exposure; a manual hot-shoe flash needs the photographer to set power by hand but works across more camera brands; a wireless trigger lets the flash come off the camera entirely; a continuous LED panel lets the photographer see the light live, which a flash's brief pulse does not allow. [6]

Values: ttl_hot_shoe, manual_hot_shoe, wireless_trigger_or_receiver, continuous_led_panel.
Question to ask: Automatic flash on camera, manual flash, wireless trigger, or continuous LED light?

Used as: top-level split, filter. Data: on the listing, backfill cost low. Look for it as: Usually stated in the title or bullets ('TTL Speedlight for Canon', 'Manual Flash', 'Wireless Flash Trigger', 'LED Video Light').
Title keyword match; TTL listings almost always name the camera brand they are built for.

### Speed rating

The card's certified read/write speed tier: UHS-I (up to 104MB/s), UHS-II (up to 312MB/s), UHS-III (up to 624MB/s), or a Video Speed Class (V30/V60/V90) for sustained video recording. A camera shooting 4K or 8K video, or long bursts of raw photos, needs a card whose sustained write speed clears the Video Speed Class the camera's manual requires, or recording stops or drops frames; UHS-II and UHS-III cards also need a compatible card slot or reader to reach their rated speed at all. [7] [8]

Values: uhs_i, uhs_ii, uhs_iii, v30, v60, v90, cfexpress_no_class_needed.
Question to ask: What speed class does your camera's video mode need?

Used as: filter, shown on the card. Data: on the listing, backfill cost medium. Look for it as: Printed on the card as a logo (UHS-I/II roman numeral in a U-shape icon, V-number in a hexagon); also in the spec table as a MB/s figure.
Needs the printed speed-class logo or MB/s figure mapped to the tier list above.
Chart: position on a sustained-write-speed axis, UHS-III and V90 fastest.

### Adapter type

What the lens adapter does beyond physically connecting two mounts: a passive mechanical adapter with no optics, a focal reducer/speed booster with a light-gathering lens inside, a teleconverter that extends focal length, or an extension tube for closer focusing. A passive adapter only works when the camera body's flange distance is shorter than the lens's own, which is why mirrorless bodies can adapt almost any older lens but DSLRs mostly cannot; a focal reducer adds a lens inside to make up that distance gap the other way and also brightens the image instead of dimming it. [14] [15]

Values: passive_mechanical, focal_reducer_speed_booster, teleconverter, extension_tube.
Question to ask: A plain mount adapter, a speed booster, or a teleconverter?

Used as: top-level split, filter. Data: on the listing, backfill cost low. Look for it as: Named in the title ('EF-to-E Mount Adapter', 'Speed Booster', '1.4x Teleconverter', 'Extension Tube Set').
Title keyword match covers nearly every listing.

### Leg lock type

How the tripod or monopod's leg sections lock at each extended length: a twist collar, a lever or flip clamp, or another mechanism. A twist lock packs flatter and resists catching on clothing or bags but needs a firm quarter-turn per section to seat; a lever or flip lock is faster to open and close by feel and shows a loose leg at a glance, at the cost of more exposed hardware that can snag. [20] [21]

Values: twist_lock, lever_or_flip_lock, other_or_unspecified.
Question to ask: Twist-lock legs or lever/flip-lock legs?

Used as: filter, shown on the card. Data: on the listing, backfill cost low. Look for it as: Named in the title or spec bullets ('Twist Lock Tripod', 'Quick-Flip Leg Locks'); brand spec sheets list it as its own row.
Title/spec-row keyword match on 'twist' vs 'lever'/'flip'/'clip'/'cam'.

### ND strength (stops)

How much a neutral-density filter darkens the image, measured in stops: a 10-stop filter cuts far more light than a 2-stop filter, and a variable ND covers a range instead of one fixed value. Each extra stop halves the light reaching the sensor, which doubles the shutter speed or lens-opening headroom available; a 10-stop filter is the strength long-exposure photographers use to turn moving water or clouds into a smooth blur in daylight. [3] [2]

Values: one_to_three_stop, six_stop, ten_stop, variable_two_to_eight_stop, not_applicable.
Question to ask: How many stops of darkening does the filter need?

Used as: filter, shown on the card. Data: on the listing, backfill cost medium. Look for it as: Printed on the filter and usually in the title as 'ND8', 'ND64', 'ND1000' (manufacturer codes) or directly as '3-stop', '10-stop'.
Requires mapping the manufacturer's ND code (ND2, ND2x, 0.3ND) to a stop count; code conventions differ by brand.
Chart: position on a light-reduction axis, 10-stop darkest.

### Light gain or loss

Whether the adapter changes how much light reaches the sensor: no change for a plain adapter, roughly a one-third to one-stop gain for a focal reducer, or a one-stop (1.4x) to two-stop (2x) loss for a teleconverter. A teleconverter's light loss grows with the square of its magnification, so autofocus can fail on lenses with a narrow enough maximum aperture once a 2x converter is attached, while a focal reducer's light gain is why it is popular for low-light and video work on mirrorless bodies. [15]

Values: no_change, gain_third_to_one_stop, loss_one_stop_1_4x, loss_two_stop_2x, not_applicable.
Question to ask: Should the adapter add light, or is some light loss fine?

Used as: filter, shown on the card. Data: needs research, backfill cost medium. Look for it as: Teleconverter listings state the magnification (1.4x, 2x) directly; focal reducers state the reduction factor (0.71x, 0.64x) which maps to the gain.
Derive from the stated magnification or reduction factor using the squared-magnification relationship.
Chart: position on a light-change axis, focal reducers gaining light, teleconverters losing it.

### Flash power class

How powerful the flash is, grouped from compact on-camera units to high-power or studio units, rather than a single comparable number since guide number drops sharply in high-speed sync mode. A compact on-camera flash is enough to fill in a shadow or light a small room; a high-power or studio unit is needed to overpower daylight outdoors or light a large space, and the same flash's rated power can fall to a third of its normal value once high-speed sync is switched on. [6]

Values: compact_on_camera, mid_power, high_power_or_studio.
Question to ask: A small on-camera flash, or a powerful studio-style light?

Used as: filter, shown on the card. Data: needs research, backfill cost medium. Look for it as: Guide number (GN) is usually printed in the spec table; bucket it, since raw GN is not comparable across brands' test conditions without checking the ISO and zoom position it was measured at.
Needs the GN figure plus product category context (on-camera speedlight vs. studio strobe) to bucket correctly.
Chart: position on a power axis, studio units highest.

### OEM or third-party

Whether the battery is made by the camera brand itself (OEM) or by a third party, and whether that third-party pack includes the chip the camera needs to show an accurate charge level. Many camera bodies refuse to report charge percentage, or refuse to run at all, on a third-party battery that lacks the camera-brand's communication chip, so a chip-matched third-party pack behaves like OEM while an unmatched one may show no battery indicator. [11]

Values: oem, third_party_chip_matched, third_party_no_chip.
Question to ask: Original brand battery, or a compatible third-party one?

Used as: filter, shown on the card. Data: on the listing, backfill cost medium. Look for it as: Third-party listings usually advertise 'chip included' or 'shows battery level' explicitly when they have it.
Needs the listing to state chip compatibility explicitly; otherwise default to third_party_no_chip as the cautious assumption.

### Safety/shipping certification

Whether the battery listing names a lithium-ion safety test standard such as IEC 62133, or only states the chemistry with no certification claim. Lithium-ion cells are classified as dangerous goods for shipping (UN3480) and are safety-tested under standards like IEC 62133 for short-circuit, overcharge and crush risk; a pack naming an actual safety standard is less likely to fail those tests than one making no certification claim at all. [22] [23]

Values: iec62133_or_equivalent_certified, generic_safety_claim_only, no_certification_stated.
Question to ask: Does the battery list a lithium-ion safety certification?

Used as: filter, shown on the card. Data: on the listing, backfill cost medium. Look for it as: Third-party pack listings sometimes print 'IEC62133 certified' or 'UN3480 compliant' in bullets; most listings state neither.
Needs an explicit certification claim in the listing text; default to no_certification_stated when absent rather than assuming compliance.

## Numbers worth computing

| Metric | Formula | Why |
|---|---|---|
| Teleconverter stop loss | `stops_lost = 2 * log2(magnification)` | Light loss scales with the square of the magnification, so a 1.4x teleconverter costs one stop (1.4 squared is about 2) and a 2x teleconverter costs two stops (2 squared is 4) — useful for predicting whether autofocus will still work on the combined aperture. [15] |

## What you give up

- Carbon fiber tripods exist specifically for applications where keeping weight down matters, such as travel and hiking, while basic aluminum tubing tripods cost under $50 and are the default for casual, stationary use. [1] Board branch: "Lighter and stiffer, but pricier".
- Passive adapters work in the direction from a long-flange-distance system onto a short-flange-distance (mirrorless) body; going the other way needs a focal reducer with a built-in lens, or does not work at all. [14] Board branch: "Mirrorless bodies adapt more lenses than DSLRs can".

## Words you will meet

- **Stop**. A doubling or halving of the light reaching the sensor; each extra stop of ND filter cuts the light in half again.
- **Guide number (GN)**. A single number a flash is rated by that combines its power and the distance it can light at a given aperture and ISO.
- **TTL**. Through-the-lens metering: the camera reads the actual light during the flash and adjusts its power automatically.
- **High-speed sync (HSS)**. A flash mode that lets the flash work above the camera's normal maximum sync shutter speed, at the cost of a lower effective guide number.
- **UHS speed class**. The SD card standard's rating for how fast a card can sustain reads and writes; UHS-I, UHS-II and UHS-III are successive speed tiers.
- **Video Speed Class**. An SD card rating (V6 through V90) that guarantees a minimum sustained write speed for recording video.
- **CFexpress**. A memory card standard built on the PCIe/NVMe interface used in computer storage, offered in the smaller Type A and larger, faster Type B form factors.
- **CIPA rating**. A standardized battery-life test from the Camera & Imaging Products Association, so shot counts from that test are comparable between batteries tested the same way.
- **Flange focal distance**. The fixed distance from a lens mount to the camera's sensor; it decides which lenses an adapter can and cannot bridge onto a given body.
- **Speed booster / focal reducer**. A lens adapter with glass inside that both bridges a flange-distance gap and brightens the image, instead of just connecting two mounts.
- **Teleconverter**. An adapter with glass inside that extends a lens's focal length, at the cost of light reaching the sensor.
- **Intervalometer**. A remote that fires the shutter automatically at set time intervals, used for time-lapse sequences.
- **Bulb exposure**. A shutter mode that stays open for as long as the shutter button or remote is held or locked down, used for long exposures.
- **Ball head**. A tripod head with a single ball joint that lets the camera tilt and rotate freely in one motion before being locked.
- **Circular polarizer (CPL)**. A polarizing filter built so autofocus and metering still work correctly on cameras that split light internally, unlike an older linear polarizer.
- **IEC 62133**. An international safety-test standard for rechargeable lithium battery cells and packs, covering short-circuit, overcharge and crush testing.
- **Dangerous goods classification (UN3480)**. The UN shipping category lithium-ion batteries fall under, which is why couriers and airlines restrict how they can be packed and shipped.

## Where we made a call

- A flash's rated guide number can drop to roughly a third of its normal value once high-speed sync is enabled. (confidence medium). Single-sourced to one worked example (a Metz unit going from GN58 to GN20 in HSS); independent corroborating measurements from other brands were unreachable this run. [6]

## References

1. [Tripod (photography)](https://en.wikipedia.org/wiki/Tripod_(photography)) (primer). Supports: Tripod/monopod legs are made of aluminum, wood or carbon fiber; Carbon fiber tripods are for lightweight needs; basic aluminum tripods cost under $50; Ball heads give free movement on all axes from one joint; Pan-tilt heads give separate control per axis; a monopod is a single-leg support.
2. [Photographic filter](https://en.wikipedia.org/wiki/Photographic_filter) (primer). Supports: Defines UV/protection, polarizing, neutral-density, graduated ND, color-correction and close-up filter types and their jobs.
3. [Neutral-density filter](https://en.wikipedia.org/wiki/Neutral-density_filter) (primer). Supports: ND filters are quantified in stops / optical density; Brand ND code conventions differ: Hoya/B+W use ND2x-style codes, Lee/Tiffen use 0.3ND-style codes; High-quality extreme ND filters are typically rated at a 10-stop reduction for daylight long exposures.
4. [Filter thread](https://en.wikipedia.org/wiki/Filter_thread) (primer). Supports: Standard circular filter sizes run from 30.5mm to 127mm; Sizes step by 3mm from 43-58mm and by 5mm from 62-82mm; Lens barrels print the accepted filter diameter after a ⌀ symbol.
5. [Polarizing filter (photography)](https://en.wikipedia.org/wiki/Polarizing_filter_(photography)) (primer). Supports: SLR and mirrorless cameras need a circular polarizer (CPL), not a linear one; This is because the camera's internal optics split light for metering and autofocus.
6. [Flash (photography)](https://en.wikipedia.org/wiki/Flash_(photography)) (primer). Supports: Guide number quantifies flash power/reach; defines TTL metering; A Metz 58 AF-1 flash has guide number 58 normally; That same flash drops to guide number 20 in high-speed sync mode.
7. [SD card](https://en.wikipedia.org/wiki/SD_card) (primer). Supports: Defines SD (up to 2GB), SDHC (up to 32GB) and SDXC (up to 2TB) capacity tiers; SDXC cards require the exFAT file system; UHS-I is rated up to 104MB/s, UHS-II up to 312MB/s, UHS-III up to 624MB/s.
8. [Memory card](https://en.wikipedia.org/wiki/Memory_card) (primer). Supports: Video Speed Class ratings (V6, V10, V30, V60, V90) set a minimum sustained write speed to avoid dropped video frames.
9. [CFexpress](https://en.wikipedia.org/wiki/CFexpress) (primer). Supports: CFexpress uses a PCIe/NVMe interface in three form factors: Type A, B, C; Sony is the only major brand using Type A; most others use Type B; No devices or cards exist yet for Type C.
10. [CFexpress Association — certification](https://www.cfexpress.org/certification/) (standards body). Supports: CFexpress is built on PCIe Gen 3/NVMe in Type A, B and C form factors; It is standardized by the CFexpress Association, formerly the CompactFlash Association.
11. [CIPA — Standards (DC-002: Standard Procedure for Measuring Digital Still Camera Battery Consumption)](https://www.cipa.jp/e/std/std-sec.html) (standards body). Supports: CIPA DC-002 is the published standard procedure for measuring digital camera battery life; It is the basis for the CIPA shot-count rating printed on batteries and camera specs.
12. [CIPA](https://en.wikipedia.org/wiki/CIPA) (primer). Supports: Identifies CIPA as the Camera & Imaging Products Association, the industry body behind the camera standards.
13. [Lithium-ion battery](https://en.wikipedia.org/wiki/Lithium-ion_battery) (primer). Supports: General lithium-ion chemistry background used by camera-proprietary and standard-cell battery packs.
14. [Lens mount](https://en.wikipedia.org/wiki/Lens_mount) (primer). Supports: A passive adapter only works when the target body's flange distance is shorter than the lens's native mount; Adapting the other way needs a secondary lens inside the adapter, or it only works as an extension tube.
15. [Teleconverter](https://en.wikipedia.org/wiki/Teleconverter) (primer). Supports: A teleconverter reduces light reaching the sensor by the square of its magnification (a 2x teleconverter costs 2 stops); Mirrorless focal reducers have a magnification below 1, typically 0.71x or 0.64x; That sub-1x magnification increases the light gathered instead of reducing it.
16. [Intervalometer](https://en.wikipedia.org/wiki/Intervalometer) (primer). Supports: Photographers use intervalometers to trigger time-lapse sequences by firing the shutter at set, calculated time intervals.
17. [Bulb (photography)](https://en.wikipedia.org/wiki/Bulb_(photography)) (primer). Supports: A cable or remote release generally includes a lock for long exposures; That lock holds the shutter open in bulb mode without the photographer holding the button.
18. [VisibleDust sensor cleaning products](https://www.visibledust.com/) (spec sheet). Supports: Sensor cleaning kits split into dry tools (air blower, brush) for loose dust; Wet swabs with cleaning fluid handle smears and oil; A sensor loupe is sold for inspecting the sensor before cleaning it.
19. [Dust reduction system](https://en.wikipedia.org/wiki/Dust_reduction_system) (primer). Supports: In-camera dust reduction vibrates the sensor filter at high frequency; It does not remove all dust or any smear/oil, so external cleaning kits remain a separate category.
20. [Peak Design — Travel Tripod (product spec)](https://www.peakdesign.com/products/travel-tripod) (spec sheet). Supports: Spec block lists 'Leg locks: Aluminum cams' as its own named spec row, separate from leg material and height.
21. [3 Legged Thing — tripod product site](https://www.3leggedthing.com/) (spec sheet). Supports: Product marketing names 'leg locks' (e.g. 'Helical Strake leg locks') as a distinct, named tripod spec across a different brand.
22. [IEC 62133-2:2017 — Secondary cells and batteries ... Part 2: Lithium systems](https://webstore.iec.ch/en/publication/32662) (standards body). Supports: IEC 62133-2:2017 specifies requirements and tests for the safe operation of portable sealed secondary lithium cells and batteries.
23. [Dangerous goods](https://en.wikipedia.org/wiki/Dangerous_goods) (primer). Supports: Lithium metal batteries (UN3090) and lithium-ion batteries (UN3480) are classified as dangerous goods for shipping.