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2. Fisheye lens - Wikipedia

   en.wikipedia.org/wiki/Fisheye_lens

   Sigma 15 mm f /2.8 EX DG Diagonal Fisheye; TTArtisan 11mm f /2.8 Fisheye (notable as the first fisheye lens marketed, among others, in Leica M rangefinder mount and for Fuji GFX (the lens does not cover the full GFX frame, though!). An expert found it is actually 15 mm in focal length and has an angle of view of only 176°.

3. List of Micro Four Thirds lenses - Wikipedia

   en.wikipedia.org/wiki/List_of_Micro_Four_Thirds...

   TTArtisan TTArtisan 17mm f / 1.4 MFT 17mm: 34mm f / 2.8 f / 1.4 40.5 ? 248 g (8.7 oz) ... The fish eye lens Laowa 4 mm f/2,8 of the manufacturer Venus Optics with an ...

4. Fujifilm G-mount - Wikipedia

   en.wikipedia.org/wiki/Fujifilm_G-mount

   Fujinon GF 63mm f/2.8 R WR standard prime lens. The crop factor compared to the 35 mm format as a reference is 0.79. Ratio of the reference frame's diagonal (35 mm format) to the diagonal of the image sensor in question (Fujifilm GFX): + () + ()

5. List of third-party Sony E-mount lenses - Wikipedia

   en.wikipedia.org/wiki/List_of_third-party_Sony_E...

   15mm f/4.5 Super-Wide-Heliar (announced 2015–10) [279] 21mm f/1.4 Nokton E [280] 21mm f/3.5 Color Skopar E [281] 35mm f/1.4 Classic Nokton (announced 2017–02) [282] 35mm f/2.0 APO-Lanthar Aspherical (announced 2021–02) [283] 40mm f/2.8 Heliar [284] 40mm f/1.2 Nokton (announced 2017–02) [285] 50mm f/1.2 Nokton Aspherical (announced 2019 ...

6. Fujifilm X-mount - Wikipedia

   en.wikipedia.org/wiki/Fujifilm_X-mount

   60 mm f/2.8 macro lens (mark 1 and 2) TTartisan Lenses (as of may 2024) 7.5mm f/2 fisheye lens; ... 12 mm f/2.0 NCS CS Ultra Wide Angle (black and silver versions)

7. Micro Four Thirds system - Wikipedia

   en.wikipedia.org/wiki/Micro_Four_Thirds_system

   The image sensor of Four Thirds and MFT measures 18 mm × 13.5 mm (22.5 mm diagonal), with an imaging area of 17.3 mm × 13.0 mm (21.63 mm diagonal), comparable to the frame size of 110 film. [4] Its area, ca. 220 mm 2 , is approximately 30% less than the APS-C sensors used in other manufacturers' DSLRs ; it is around 9 times larger than the 1/ ...

8. f-number - Wikipedia

   en.wikipedia.org/wiki/F-number

   A Canon 7 mounted with a 50 mm lens capable of f /0.95 A 35 mm lens set to f /11, as indicated by the white dot above the f-stop scale on the aperture ring. This lens has an aperture range of f /2 to f /22. The word stop is sometimes confusing due to its multiple meanings. A stop can be a physical object: an opaque part of an optical system ...

9. Olympus Zuiko Digital 11-22mm f/2.8-3.5 - Wikipedia

   en.wikipedia.org/.../2.8-3.5

   The Olympus Zuiko Digital 11-22mm 1:2.8-3.5 is an interchangeable wide angle zoom lens for the Four Thirds system. It was announced by Olympus Corporation on June 24, ...