Canon R6 Mark III Accessories: What to Buy First, in Order

Buy a spare Canon LP-E6P battery and a two-slot charger first, then a CFexpress Type B card for slot 1 and a UHS-II SD card for slot 2. After that, add a wireless mic for the mic jack, a cage, a variable ND filter and a strap, and hold off on the BG-R10 battery grip, which does not take LP-E6P batteries.

The Canon EOS R6 Mark III changed two things that drive your first purchases. It uses the newer LP-E6P battery, and it swapped the R6 Mark II's dual SD slots for one CFexpress Type B slot and one UHS-II SD slot. Batteries and cards carried over from an older Canon body will only take you part of the way.

The buying order at a glance

Order	Accessory	Why it sits here
1	Spare LP-E6P battery and a dual charger	Older packs lose the fastest drive speed, pre-continuous shooting and advanced video features
2	CFexpress Type B card	Faster format and a deeper burst buffer
3	UHS-II SD card	Second slot for backup, relay or proxy recording
4	Wireless mic kit	The camera has a dedicated mic jack and headphone jack
5	Cage	Mounting points for the mic receiver and other add-ons
6	77mm variable ND	Lets you keep video shutter speeds and wide apertures in bright light
7	Strap	Cheap insurance for an expensive body

1. A spare LP-E6P battery and a dual charger

PetaPixel's review says the R6 Mark III's LP-E6P battery is required for certain features and for optimal performance, and that using older batteries is not recommended. Fstoppers lists the LP-E6N and LP-E6NH as usable with restrictions.

Which batteries actually work

Battery	Works in the R6 Mark III?	What you give up
LP-E6P	Yes	Nothing: this is the camera's own battery
LP-E6NH (2130 mAh)	Yes, with limits	Fastest drive speed, pre-continuous shooting, most advanced video features
LP-E6N (1865 mAh)	Yes, with limits	Same limits as the LP-E6NH
Original LP-E6	No	Not supported
Third-party packs designed before the LP-E6P	No	Battery error message at power-on

Pre-continuous shooting captures 20 frames before the shutter press, according to Fstoppers. That is one of the features an older battery locks out. The-Digital-Picture also notes that older packs trigger battery type reminders on power-up and wake-up, which the reviewer felt made a full move to the LP-E6P worth the cost.

One battery in the camera and one in your pocket is the sensible starting point. In PetaPixel's overheating tests, which ran on battery only with no USB-C charging, 4Kp30 Fine video ran 103 minutes before the battery died. If you film long events, that number tells you a single pack will not cover a full day.

The charger

A two-slot USB-C charger lets you top up both packs at once from a wall plug, a laptop charger or a power bank. Charge both the night before, and you leave for a shoot with the camera battery and the spare full.

For more on spares across brands, see Best Spare Batteries for Canon, Sony & Nikon.

2. Memory cards: one CFexpress Type B, one UHS-II SD

Slot 1 takes a CFexpress Type B card and slot 2 takes an SDXC UHS-II card. Newsshooter notes that both slots sit on the right-hand side of the camera, behind the grip.

Slot	Card type	Good use
1	CFexpress Type B (CFexpress 2.0, VPG400, up to 8TB supported)	Main recording: bursts and high-bitrate video
2	SD/SDHC/SDXC UHS-II	Backup copy, relay overflow or proxy files

Slot 1: why the CFexpress card comes first

PetaPixel says that to take full advantage of the camera, including its 40 fps continuous shooting, a CFexpress Type B card is well worth getting. The buffer grew with the switch: about 150 RAW and JPEG shots, up from 75 on the R6 Mark II, about 280 CRAW frames, and about 330 JPEG-only frames at 40 fps. In The-Digital-Picture's buffer test with a Lexar 2TB Professional GOLD CFexpress 4.0 Type B card, the camera captured 254 images in 7 seconds before the buffer filled, then cleared it in 5.4 seconds.

The-Digital-Picture lists support for CFexpress 2.0 cards rated VPG400. The SanDisk Extreme PRO CFexpress Type B 256GB is a reasonable size for a first card: big enough for long burst sessions without putting a whole shoot on one very large card.

The CFexpress slot also matters for video. Fstoppers lists recording up to 7K/59.94p in raw light, 7K/30p open gate and 4K/119.9p. Set slot 1 as your main recording card for those modes.

Watch card heat in RAW video

In PetaPixel's tests, 4Kp24 RAW stopped after 42 minutes because the CFexpress card overheated, not the camera. PetaPixel describes this as a separate card overheat warning and notes it does not see the limit on cameras with a built-in fan like the C50. If you shoot long RAW takes, break them into shorter clips and swap cards between setups when you can.

Slot 2: a UHS-II SD card

Newsshooter explains that the two slots let you record the same footage to both cards, record different formats at once, relay from one card to the other, or put main footage on one card and proxies on the other. The-Digital-Picture points out that this setup preserves your investment in SD cards.

Buy a UHS-II card rather than a cheaper UHS-I card, since the slot is built for UHS-II. The SanDisk 128GB Extreme PRO SD UHS-II card carries a V90 label, the highest video class you will see on SD cards, and it is a good partner for backup copies or proxies.

For the bigger picture on formats, read Memory Cards: SD vs CFexpress.

3. A wireless mic kit for the 3.5mm jack

The R6 Mark III has dedicated mic and headphone jacks, so you can plug a mic in and listen to it at the same time. Digital Camera World also lists 4-channel audio among its video features. Wear headphones on every take: a dead transmitter or rustling clothing is easy to hear live and impossible to fix later.

The DJI Mic Mini kit with two transmitters, one receiver and a charging case covers interviews and two-person conversations. DJI's spec page lists battery figures of approximately 11.5 hours and approximately 10.5 hours, measured with noise cancellation off and the receiver connected to a camera through the 3.5mm TRS Camera Audio Cable. A fully charged case can recharge two transmitters and the receiver about 3.6 times, according to DJI. DJI quotes a range of 400 m, measured in an open, unobstructed area free of interference, and calls that figure reference only.

The camera's multi-function shoe is another route. PetaPixel says its electronics support new accessories, including mics, and Newsshooter notes it lets some Canon accessories work without cables, in some cases without batteries. A wireless kit on the 3.5mm jack is the more flexible first buy, because the transmitters clip onto your subject instead of sitting on the camera.

Once the mic is set up, work through Canon R6 Mark III Video Settings for Beginners.

4. A cage

A cage gives you places to mount the mic receiver, a small light or a handle without stacking everything on the hot shoe. The SmallRig Camera Cage for the R6 Mark III and R6 Mark II uses NATO rails for quick-release handles.

The R6 Mark III moved from a micro HDMI port to a full-size HDMI Type A port. A cage with a cable clamp keeps a monitor cable from pulling on that port. Because the card slots sit on the grip side, check that any cage leaves the card door and the battery door reachable, so you can swap cards and batteries without taking the cage off.

5. A 77mm variable ND filter

If that lens is your main zoom, a variable ND is the filter to buy first. Check the filter size printed on the front of your lens or its cap before ordering, and buy filters to match.

For video, a common starting point is a shutter speed near double your frame rate, such as 1/50 second at 24p. In daylight that overexposes fast at f/4, and a variable ND lets you dial the light down without closing the aperture or pushing the shutter faster. Turn it slowly and watch the screen: at the darkest settings, any variable ND can show uneven patches, so test yours before a real job.

A circular polarizer, like the Tiffen 77mm CPL, is a later buy for landscape and reflection control. Do not stack it with the variable ND on day one.

6. A strap

A quick-release strap costs little next to the body and lets you switch between neck, shoulder and sling carry. The Peak Design Slide Lite is a solid choice that comes off fast when you put the camera on a tripod or gimbal.

What to skip early

The BG-R10 battery grip

The-Digital-Picture reports that the BG-R10 fits the R6 Mark III but does not support some of the camera's advanced features and is not compatible with the new LP-E6P batteries. Spend that money on a second LP-E6P instead.

Old or third-party batteries

Do not stock up on cheap older packs. Third-party batteries designed before the LP-E6P cause a battery error message, and the original LP-E6 is not supported.

An external recorder

Newsshooter notes the camera can output 7K RAW over HDMI to an Atomos Ninja V+ for ProRes RAW. With raw light already recorded internally to CFexpress, most new owners do not need a recorder in their first months.

An EF adapter you do not need

EF and EF-S lenses work through the Mount Adapter EF-EOS R. Buy one only if you already own EF glass.

Drones, studio softboxes and other big-ticket extras

A drone like the DJI Mini 3 Fly More Combo or a Profoto Clic Softbox Octa may be on your list, but they solve problems you have not met yet. Shoot for a few weeks with batteries, cards, a mic and an ND, then buy for the gaps you actually hit. For more on this, see Accessories Beginners Buy Too Early (And What to Buy Instead).

Before your first shoot

With batteries charged and both cards formatted in the camera, set up recording and card options before you go out. Canon R6 Mark III Setup: Settings to Change Before Your First Shoot walks through the menus, including how to assign the two card slots.