Choose the problem you are trying to solve, then confirm your exact product codes in the official references.
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What is a camera lens mount?A mount is the mechanical and, often, electronic interface between a lens and body. Matching brand names is insufficient because one brand can use several unrelated mounts.→Canon RF vs EF: what changes when you move to EOS R?RF lenses attach directly to an EOS R body. EF lenses use a Canon EF-EOS R adapter; the adapter direction cannot be reversed.→Why Canon EF-S is listed separately from EFEF-S identifies an APS-C SLR lens family. Some EOS R bodies accept EF-S through an EF-EOS R adapter with a smaller recording area.→Can Canon EF-M lenses move to an EOS R body?Canon's EOS R support list excludes EF-M from the EF-EOS R adapter route. EF-M and EF are distinct mounts despite similar lettering.→Nikon Z vs F mount when keeping DSLR lensesNikon Z bodies use a different mount from F lenses. FTZ II is the official F-lens-to-Z-body route, with functions dependent on lens class.→Sony E vs A mount and adapter choicesSony E is the mirrorless body mount while A is the earlier SLR family. LA-EA adapters connect A lenses to supported E bodies, but their AF limits differ.→Fujifilm X vs G mountFujifilm X and G identify different camera systems and sensor sizes; a matching brand name does not make their lenses interchangeable.→What the L-Mount Alliance standard coversL-Mount is a shared mount across alliance products. Basic mechanical interchange does not mean every body implements every lens feature in the same way.→Micro Four Thirds vs Four Thirds lensesThese standards share a sensor format but not the same physical mount. The standards organization says Four Thirds lenses can be used on MFT with an adapter.→How to identify a Pentax K lens versionK-mount lenses span mechanical and electronic generations. A K label alone cannot prove aperture control, AF or compatibility with an adapter.→Checks before adapting a Leica M lensM-mount rangefinder lenses are often manual. Rear clearance and focus behavior must be checked on the adapter and target body.→How to identify an M42 screw lensA screw thread is not enough to identify pitch or safe flange clearance. Several older threaded systems are easy to confuse.→Why M39 and LTM labels need a closer lookM39 can refer to more than one historical specification. An adapter advertised only as M39 may not establish the intended register distance.→ARRI PL vs still-camera lens mountsPL is a cinema lens mount with its own mechanical and image-circle considerations. A cinema lens may need clearance and coverage checks beyond an adapter ring.→Medium-format mounts vs full-frame camerasA larger format label does not tell you how a lens will mount on a smaller camera. Mount geometry and controls differ by system.→Which direction does a lens adapter work?An adapter is named for the lens it accepts and the body it attaches to. EF-EOS R means EF lens to EOS R body, not the reverse.→Electronic vs manual lens adaptersElectronic contacts can transfer some control or data, but they do not guarantee every AF mode. A passive adapter may require manual focus or lensless-shutter settings.→Canon EF-EOS R adapter optionsCanon offers more than one EF-EOS R form, including a drop-in filter type. All are a lens-to-body route and insert choices are model-specific.→
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