Cameras Ranked

Lens fit, cards, batteries and flash

Will it mount, and what will it actually do?

Which of your lenses keep autofocus on a new body, which take a teleconverter, which filter size to buy, and which card, battery or flash your camera supports, from each maker's own lists.

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How we rank

Every question on this site

13 guides

Each answer comes from the maker's or the standards body's own published documents, listed at the bottom of its page with the date we read them.

Lenses, mounts and accessories

What mounts, what still autofocuses, and what an extender or filter needs in order to fit.

  • Will my old lenses work on this body?

    Which lenses physically mount, which keep autofocus and aperture control through an adapter, and why adapting works in one direction and not the other. Including the exceptions manufacturers publish themselves.

  • What a focal length does on your sensor

    How to translate a focal length and an f-number between full frame, APS-C and Micro Four Thirds — separating what changes framing, what changes depth of field, and what changes exposure. They are not the same answer.

  • Will a Nikon Z teleconverter fit my lens?

    Check your NIKKOR Z lens against Nikon's ten-lens list for the TC-1.4x and TC-2.0x, see the focal length and f-number each gives, and the firmware and mounting rules.

  • Will the Fujifilm 1.4x or 2x fit my lens?

    Check the seven XF lenses Fujifilm lists for the XF1.4X TC WR and XF2X TC WR, the lens firmware each converter needs, and the order to update camera and lens.

  • Which polarizer size covers all my lenses?

    Find the largest filter thread among your lenses, step the others up to it, and check thread pitch, your widest lenses, the hood and the cap before you order.

  • Will Your APS-C Lens Work on a Full-Frame Body?

    See what Nikon, Canon and Sony actually document: which APS-C lenses mount and crop automatically, which are physically blocked, and the exact resolution and settings involved for each system.

  • Will a cross-brand lens on my mount autofocus and stabilize?

    What Micro Four Thirds and L-Mount actually promise across member brands, and where to check one feature, stabilization, that varies by pairing.

Cards, batteries and flash

The card, battery or flash your body supports, from its maker's own specifications.

  • Which card won't stop recording

    A card box carries up to four speed systems plus a bus type, and only some of them are promises about sustained writing. How to read them against the bitrate your own camera's manual states.

  • Which LP-E6 or EN-EL15 does my camera need?

    Match Canon LP-E6, Nikon EN-EL15 and Sony NP-FZ100 part numbers to your body, and see what an older pack in the same family switches off or slows down.

  • Will this Fujifilm flash work on my body?

    Check your exact X or GFX body against Fujifilm's flash charts, camera pages and manuals, see where they disagree, and which camera and EF-X500 firmware to update.

  • Type A or Type B CFexpress: which fits your camera?

    The two CFexpress card shapes are not interchangeable. See the exact spec-sheet field that tells you which one your camera needs, with confirmed examples across brands.

  • Will a UHS-II Card Work in Your UHS-I Camera?

    Whether your camera's card slot is rated UHS-I or UHS-II, and what that means for a UHS-II card's real speed, using the SD Association's own bus-mode numbers.

  • My camera says "Card Error." Format or replace?

    Covers the write-protect switch, formatting in-camera versus with the SD Association's tool, how quick and full format differ by camera maker, and when a card error means the card itself needs replacing.

Five things the spec sheet buries

Each of these comes from a manufacturer's own manual, specification sheet or compatibility document — where the exceptions are actually written down.

  • Nikon publishes the exception count itself: the FTZ II adapter mounts approximately 360 F-mount lenses, but only 94 of them — the AF-S, AF-P and AF-I types with a motor inside the lens — keep full autofocus and autoexposure. Older screw-drive AF-D lenses mount and meter but focus manually, because neither FTZ contains a drive motor. Observed, Nikon UK FTZ II page, accessed 2026-09-22.

  • Adapting works in one direction because of flange focal distance — the gap between the lens mount and the sensor. Nikon states its Z mount has a 55 mm inner diameter and a 16 mm flange focal distance; the F mount it replaced sits much further out. An adapter is a spacer, so a DSLR lens can move onto a mirrorless body and still reach infinity focus, while the reverse leaves no room. Flange figure observed, Nikon USA Z-mount page; the one-directional consequence is inferred from that figure. Accessed 2026-09-22.

  • "Full frame" is not one number. Canon's EOS R5 manual states full-frame shooting captures approximately 36.0 x 24.0 mm; Sony's a7 IV specification states 35.9 mm x 23.9 mm; Fujifilm's X-T5 states 23.5 mm x 15.7 mm; OM System's OM-1 Mark II states 17.3 x 13.0 mm. Crop factor is the ratio of those diagonals, not a brand label. All four observed from manufacturer specification pages, accessed 2026-09-22.

  • Mount a crop-format lens on a full-frame Canon body and the camera decides for you. Canon's EOS R5 manual: "RF-S and EF-S lenses capture a 3:2 area in the center at an approx. 1.6 crop factor (APS-C size)", and "Areas outside the cropped area are not recorded in RAW shooting." The cropped pixels are gone, not recoverable later. Observed, Canon EOS R5 product manual, accessed 2026-09-22.

  • An SD card carries up to four different speed systems plus a bus type, and only some of them are promises. Speed Class (C2/C4/C6/C10), UHS Speed Class (U1/U3) and Video Speed Class (V6/V10/V30/V60/V90) are minimum sustained write speeds in MB/s — 30 MB/s for both U3 and V30, 90 MB/s for V90. The large "up to" number on the front of the package is a maximum read figure, not a guarantee. Minimums observed from SanDisk's support article; the four-system structure observed from the SD Association. Accessed 2026-09-22.

Who this is for

People who have already picked a camera system and are stuck on one concrete fit question before they spend money: which lenses keep autofocus on this body, which lenses take a teleconverter, which card or battery the body supports, or whether a flash will work on it. It is not for someone asking which camera to buy.