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2. Canon RF lens mount - Wikipedia

   en.wikipedia.org/wiki/Canon_RF_lens_mount

   The Canon RF lens mount is an interchangeable- lens mount developed by Canon for its full-frame mirrorless interchangeable-lens cameras, and featured first by the EOS R, followed by the EOS RP. [3] [4] [5] The RF mount was announced in September 2018. [6] [7] In May 2022, Canon announced APS-C EOS R cameras (the EOS R10 and EOS R7) and RF-S ...

3. Sigma 50-500mm f/4-6.3 DG lens - Wikipedia

   en.wikipedia.org/wiki/Sigma_50-500mm_f/4-6.3_DG_lens

   86 mm. Retail info. MSRP. $1059.00 USD. The Sigma 50-500mm f/4-6.3 EX DG HSM is a super-telephoto zoom lens produced by Sigma Corporation. It is commonly known as the " Bigma " because of its long and heavy body. It contains four SLD (Special Low Dispersion) glass elements to provide correction for chromatic aberration.

4. Sigma 300–800mm f/5.6 EX DG HSM lens - Wikipedia

   en.wikipedia.org/wiki/Sigma_300–800mm_f/5.6_EX...

   Retail info. MSRP. $8,000 (in USA, since April 2013) USD. The Sigma 300 – 800 mm lens is a professional-level supertelephoto zoom lens made by Sigma Corporation [1] from 2002 to 2019 for use with analog and digital SLRs. Due to its massive size and weight, the lens has been nicknamed the "Sigmonster" [2]

5. Four Thirds system - Wikipedia

   en.wikipedia.org/wiki/Four_Thirds_system

   The Four Thirds System is a standard created by Olympus and Eastman Kodak for digital single-lens reflex camera (DSLR) design and development. [ 1] Four Thirds refers to both the size of the image sensor (4/3") as well as the aspect ratio (4:3). The Olympus E-1 was the first Four Thirds DSLR, announced and released in 2003.

6. Category:Canon RF lenses - Wikipedia

   en.wikipedia.org/wiki/Category:Canon_RF_lenses

   RF lenses made by Canon Inc. ... Canon RF lens mount This page was last edited on 19 September 2021, at 20:06 (UTC). Text is available under the ...

7. Flange focal distance - Wikipedia

   en.wikipedia.org/wiki/Flange_focal_distance

   Diagram illustrating the flange focal length of an SLR–type and a mirrorless–type camera. For an interchangeable lens camera, the flange focal distance (FFD) (also known as the flange-to-film distance, flange focal depth, flange back distance (FBD), flange focal length (FFL), back focus [1] or register, depending on the usage and source) of a lens mount system is the distance from the ...