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2. Depth-of-field adapter - Wikipedia

   en.wikipedia.org/wiki/Depth-of-field_adapter

   A DOF adapter could theoretically be used on a multitude of platforms, although it is most useful on prosumer digital camcorders where high resolution is a capability but the sensor size is still small enough to elicit use of the adapter. The term 35mm adapter is common, since most designs use a focusing screen the size of a 35mm film frame (24 ...

3. 35 mm equivalent focal length - Wikipedia

   en.wikipedia.org/wiki/35_mm_equivalent_focal_length

   35 mm equivalent focal lengths are calculated by multiplying the actual focal length of the lens by the crop factor of the sensor. Typical crop factors are 1.26× – 1.29× for Canon (1.35× for Sigma "H") APS-H format, 1.5× for Nikon APS-C ("DX") format (also used by Sony, Pentax, Fuji, Samsung and others), 1.6× for Canon APS-C format, 2× for Micro Four Thirds format, 2.7× for 1-inch ...

4. Pentax K-mount - Wikipedia

   en.wikipedia.org/wiki/Pentax_K-mount

   Carl Braun Camera-Werk of Nuremberg, Germany, or Braun, as it was more commonly called, was founded as an optical production house. It is best known for its 35mm film cameras named Paxette, and for slide projectors named Paximat. Braun Ultralit Zoom 28–70 mm f3.4-4.8

5. Fujica X-mount - Wikipedia

   en.wikipedia.org/wiki/Fujica_X-mount

   The Fujica "slide copier X" mounted on the "focusing rail X" simplifies the copying of 135 film pictures. The "macro cine copy X" is a macro lens with specific windows to take copies from 8 mm and 16 mm films. The "microscope adapter X" to adapt the camera body to a microscope. A "reverse adapter X", that can be mounted with an extension tube.

6. Canon FD lens mount - Wikipedia

   en.wikipedia.org/wiki/Canon_FD_lens_mount

   This makes the system very attractive to 35mm film photographers who demand the highest optical quality, [4] [5] while not needing auto focus capability. FD lenses can be used on many mirrorless interchangeable-lens cameras with a suitable adapter. They are a popular alternative to modern lenses among some users, though they lack autofocus.

7. List of Pentax products - Wikipedia

   en.wikipedia.org/wiki/List_of_Pentax_products

   3.1.4 Full frame (35mm) film and digital era prime lenses 3.1.5 Full frame (35mm) film and digital era zoom lenses 3.1.6 Compact lenses designed for K-01 camera