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AF 27/1.2 E Pro [37] 2023-12 27mm: f / 1.2: f ... the autofocus version of the similar full frame manual focus PFU RBMH 85mm f/1.8 Viltrox: AF 85/ ... 35mm f/1.7 Lens ...
Until 2018, all third party lenses were manual except from the three Zeiss Touit lenses. In 2019, Viltrox introduced a 85 mm f/1.8 AF lens lacking an aperture ring. [39] In April 2020, the same company introduced a 33 mm f/1.4 lens with an aperture ring. Two more Viltrox lenses, 23 mm f/1.4 and 56 mm f/1.4, are announced for 2020. [40]
The M42 lens mount is a screw thread mounting standard for attaching lenses to 35 mm cameras, primarily single-lens reflex models. It is more accurately known as the M42 × 1 mm standard, which means that it is a metric screw thread of 42 mm diameter and 1 mm thread pitch.
A 50mm anamorphic lens with a 2x squeeze will have the horizontal view of a 25mm spherical lens, while maintaining the vertical view and depth of field of a 50mm. This has led to the common claim that anamorphic lenses have shallower focus, as the cinematographer must use a longer lens to obtain the same horizontal coverage.
Cylindrical lenses. A cylindrical lens is a lens which focuses light into a line instead of a point as a spherical lens would. The curved face or faces of a cylindrical lens are sections of a cylinder, and focus the image passing through it into a line parallel to intersection of the surface of the lens and a plane tangent to it along the cylinder's axis.
So a standard 50 mm lens for 35 mm photography acts like a 50 mm standard "film" lens even on a professional digital SLR, but would act closer to a 75 mm (1.5×50 mm Nikon) or 80 mm lens (1.6×50mm Canon) on many mid-market DSLRs, and the 40-degree angle of view of a standard 50 mm lens on a film camera is equivalent to a 28–35 mm lens on ...
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