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2. Pentax Auto 110 - Wikipedia

   en.wikipedia.org/wiki/Pentax_Auto_110

   Lens hoods were available for all of the lenses, and Pentax sold add-on close-up lenses for macro photography and a range of filters. The 110 lenses have found a new life with the Pentax Q system, which will accept them with an adapter, albeit with a 5.6x crop factor (effective increase in focal length). [2]

3. Pancake lens - Wikipedia

   en.wikipedia.org/wiki/Pancake_lens

   A body-cap lens is an extreme type of pancake lens that is designed to both protect the camera internals as a body cap normally would, yet still allow the user to take photos. These lenses are manual focus only and generally have no more than a couple of optical lens elements, no image correcting elements, a very-slow fixed aperture, an ...

4. Close-up lens - Wikipedia

   en.wikipedia.org/wiki/Close-up_lens

   That distance is sometimes given on the filter in millimeters. A +3 close-up lens has a maximal working distance of 0.333 m or 333 mm. The magnification is the focal distance of the objective lens (f) divided by the focal distance of the close-up lens; i.e., the focal distance of the objective lens (in meters) multiplied by the diopter value (D) of the close-up lens:

5. Category:Photographic lenses - Wikipedia

   en.wikipedia.org/wiki/Category:Photographic_lenses

   A photographic lens or objective is an integrated system comprising one or more simple optical lens elements, which produces an image of a distant object. The main article for this category is Photographic lens .

6. Photographic lens design - Wikipedia

   en.wikipedia.org/wiki/Photographic_lens_design

   Prime lens - a photographic lens whose focal length is fixed, as opposed to a zoom lens, or that is the primary lens in a combination lens system. Zoom lenses - variable focal length lenses. Zoom lenses cover a range of focal lengths by utilising movable elements within the barrel of the lens assembly.

7. Nikonos - Wikipedia

   en.wikipedia.org/wiki/Nikonos

   Third-party close-up lenses; Because the numbered Nikonos cameras did not offer through-the-lens viewing, the extremely shallow depth of field for macro photography pragmatically required a focusing aid. The extension tube and Close Up Kit systems used a framer, which attached to the lens assembly and provided a direct physical index for the ...