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2. Canon EF lens mount - Wikipedia

   en.wikipedia.org/wiki/Canon_EF_lens_mount

   Lenses for the earlier Canon FD lens mount are not usable for general photography on an EF mount cameras, unless adapters with optical elements are used because they are made for a flange focal distance of only 42.0 mm. Infinity focus would be lost with an adapter which lacks optical elements. The Canon FD-EOS adapter is rare and is only usable ...

3. Canon EF-M lens mount - Wikipedia

   en.wikipedia.org/wiki/Canon_EF-M_lens_mount

   The EF-M lens mount is one of Canon's two systems for mirrorless cameras, the other being the RF mount. The M system has an 18 mm flange focal distance (compared to 20 mm for RF and 44 mm for EF and EF-S) and a 47 mm throat diameter (compared to 54 mm for EF, EF-S, and RF). As it is designed for use with an APS-C-sized image sensor, it features ...

4. List of Canon products - Wikipedia

   en.wikipedia.org/wiki/List_of_Canon_products

   Canon developed and produced the Canon FD lens mount standard for film SLR cameras from 1971 to replace the FL lens mount standard. The FD mount had two variants – original lenses used a breechlock collar to mount whilst later versions used a standard bayonet twist lock with a short twist action. The EF lens mount standard superseded FD ...

5. Lenses for SLR and DSLR cameras - Wikipedia

   en.wikipedia.org/wiki/Lenses_for_SLR_and_DSLR...

   The gold-plated electronic contacts of an EF-mount lens. Canon introduced the EF-lens mount in 1987 as part of the EOS system. It broke with the most common technique for implementing autofocus at that time by not having a mechanical connection to a motor in the camera body, having instead only electrical connections and requiring a motor to be ...

6. Canon RF lens mount - Wikipedia

   en.wikipedia.org/wiki/Canon_RF_lens_mount

   Canon full-frame cameras have used the EF lens mount since 1987. In comparison with that mount, the RF mount's inner diameter is the same at 54 mm. [1] The RF mount's flange focal distance at 20 mm is much shorter than that of the Canon EF and EF-S mounts at 44 mm.

7. Canon FD lens mount - Wikipedia

   en.wikipedia.org/wiki/Canon_FD_lens_mount

   Canon New FD lens mounting surface.. The FD lens mount is a breech-lock mount, which is a variation of the common triple-flanged bayonet attachment. The advantage of the breech-lock over the bayonet is that neither the contact surfaces between the body and lens, nor the signalling mechanisms, rotate against each other when the lens is mounted.