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2. Canon EF 28-90mm lens - Wikipedia

   en.wikipedia.org/wiki/Canon_EF_28-90mm_lens

   The Canon EF 28–90mm f / 4–5.6 is a full frame SLR zoom lens, also often included as a kit lens with Canon EOS film cameras. The maximum aperture is f / 4 at 28mm, reducing to f / 5.6 at 90mm. When set to 90mm, this will create a moderate amount of background blur for portrait photography.

3. Canon R lens mount - Wikipedia

   en.wikipedia.org/wiki/Canon_R_lens_mount

   The Canon R lens mount is a physical standard for connecting a camera lens to a 35mm single-lens reflex camera body. It was introduced in March 1959 along with the Canon Canonflex . Design and history

4. Canon EF-S lens mount - Wikipedia

   en.wikipedia.org/wiki/Canon_EF-S_lens_mount

   The "S" in EF-S has variously been described by Canon as coming from either "Small image circle" [1] (the lens projects a smaller image circle than normal EF lenses to match the sensor), or "Short back focus" [2] (the smaller mirror used in APS-C cameras also allows optical elements to protrude further into the camera body, reducing the minimum ...

5. Lens mount - Wikipedia

   en.wikipedia.org/wiki/Lens_mount

   Canon PowerShot A and Canon PowerShot G cameras have a built-in or non-interchangeable primary (zoom) lens, and Canon has "conversion tube" accessories available for some Canon PowerShot camera models which provide either a 52mm or 58mm "accessory/filter" screw thread. Canon's close-up, wide- (WC-DC), and tele-conversion (TC-DC) lenses have 2 ...

6. Canon Canonflex - Wikipedia

   en.wikipedia.org/wiki/Canon_Canonflex

   Its standard lens is the Super-Canomatic R 50mm f / 1.8, using the first version of Canon's breech-lock manual-focus lens mount, the R lens mount, which would evolve into the Canon FL and Canon FD lens mounts over the next three decades. The Super-Canomatic lens features fully automatic aperture operation, using two internal connections. [4]

7. Canon EF lens mount - Wikipedia

   en.wikipedia.org/wiki/Canon_EF_lens_mount

   That lens was the Canon EF 70-300mm f/4-5.6L IS USM. Canon in 2011 made the first fisheye zoom lens, both circular and rectangular. That lens was the Canon EF 8-15mm f/4L Fisheye USM. Canon in 2012 made the first wide angle lens with Image Stabilization. That lens was the Canon EF 24mm f/2.8 IS USM. Canon in 2013 created the first telephoto ...