Each topic groups a distinct compatibility question and links to the relevant check or official document.
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Choosing a lens mount adapterRead the lens-side and camera-side mount in that order. A mechanically fitting ring does not promise autofocus or aperture control.→Full-frame bodies and crop lensesA smaller image circle can trigger a crop or leave dark corners. Canon explicitly describes an APS-C crop for its RF-S18-45mm on supported full-frame EOS R bodies.→Autofocus limits across systemsStill AF, continuous AF and movie AF are separate questions. Sony's LA-EA5 documentation explicitly excludes movie AF.→Firmware and lens compatibilityRecord the body, lens and adapter firmware before reading a support table; an older revision can change the result.→Using vintage manual lenses safelyInspect rear protrusions and manufacturer exclusions before mounting. Nikon publishes a list of F lenses and accessories that must not be mounted.→Identify third-party lens variantsKeep the manufacturer model code and mount version together. Tamron A063 is sold for both Sony E and Nikon Z as distinct mount versions.→Find a lens filter threadUse the front thread diameter from the exact lens specification, never the focal length. Canon's RF-S18-45mm is a 49 mm example.→Step-up vs step-down ringsA 67→77 ring starts at a 67 mm lens thread and accepts a 77 mm filter. Reversing it creates a step-down route with greater vignetting risk.→Magnetic filter systemsA diameter match alone does not establish magnetic coupling. Confirm the specific maker's base ring and filter system before purchase.→Square filter holdersCheck the holder's lens adapter ring, filter width and wide-angle clearance separately; ordinary front-thread size is only the first input.→Drop-in and rear filtersA drop-in filter may belong to a specific adapter rather than the lens front. Verify the precise Canon adapter variant and insert.→Teleconverter compatibilityMatch an exact lens and converter model. Shared mount names alone do not prove rear clearance, AF range or aperture support.→Video autofocus with adapted lensesTest movie AF separately from still AF. Sony explicitly states LA-EA5 movie AF is unavailable.→Lens and body stabilizationOptical stabilization and sensor-shift stabilization can coexist, but coordinated behavior is model-specific.→Physical mount safetyStop if a lens meets resistance. Nikon lists older products that cannot safely be mounted through FTZ routes.→Used lens purchase checklistAsk for the exact model code, rear-mount photo, firmware version, filter thread and a working test on your body.→Similar model names and different mountsCanon EF, EF-M and RF are different; Tamron A063 Sony E and Nikon Z versions also need distinct identities.→
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