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2. Lens board - Wikipedia

   en.wikipedia.org/wiki/Lens_board

   Depending on the size and focal length of a particular lens, a certain diameter of hole is drilled in the center of the lens board to accommodate the shutter assembly. Lens boards are typically available pre-drilled by the camera manufacturer, however, if no replacement lens board is available from a camera manufacturer, then one can be custom fabricated by a machinist.

3. Exploded-view drawing - Wikipedia

   en.wikipedia.org/wiki/Exploded-view_drawing

   An exploded-view drawing is a diagram, picture, schematic or technical drawing of an object, that shows the relationship or order of assembly of various parts. [1]It shows the components of an object slightly separated by distance, or suspended in surrounding space in the case of a three-dimensional exploded diagram.

4. 1951 USAF resolution test chart - Wikipedia

   en.wikipedia.org/.../1951_USAF_resolution_test_chart

   A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens.

5. Template:Pentax K-mount lens compatibility chart - Wikipedia

   en.wikipedia.org/wiki/Template:Pentax_K-mount...

   lens function compatibility Bayonet > K, M A F, FA, D-FA FA Powerzoom FA-J DA, DA-L DA-SDM, DA-DCM (KAF3) DA, D-FA (KAF4) Main changes: Camera First K-mount version A-position, electrical contacts Screw drive, with contacts for serial communication Two contacts for Powerzoom Aperture ring abandoned Small image circle In lens autofocus motor

6. List of telescope parts and construction - Wikipedia

   en.wikipedia.org/wiki/List_of_telescope_parts...

   Objective: The first lens or curved mirror that collects and focuses the incoming light. Primary lens: The objective of a refracting telescope. Primary mirror: The objective of a reflecting telescope. Corrector plate: A full aperture negative lens placed before a primary mirror designed to correct the optical aberrations of the mirror.

7. Diaphragm (optics) - Wikipedia

   en.wikipedia.org/wiki/Diaphragm_(optics)

   Nine-blade iris Pentacon 2.8/135 lens with 15-blade iris Aperture mechanism of Canon 50mm f/1.8 II lens, with five blades In the human eye, the iris (light brown) acts as the diaphragm and continuously constricts and dilates its aperture (the pupil) A 750nm titanium-sapphire laser beam passing through an iris diaphragm, while opening and closing the iris.

8. Pentax (lens) - Wikipedia

   en.wikipedia.org/wiki/Pentax_(lens)

   The DA* lenses are more expensive and generally feature improved light transmission and larger aperture openings for better low light performance. Some DA* lenses also feature both body driven screw drive focusing and the Pentax SDM (Supersonic Drive Motor) lens based focus mechanism. Some lenses of this product line were co-developed with ...

9. Marine hatchetfish - Wikipedia

   en.wikipedia.org/wiki/Marine_hatchetfish

   Marine hatchetfishes or deep-sea hatchetfishes are small deep-sea mesopelagic ray-finned fish of the stomiiform subfamily Sternoptychinae.They should not be confused with the freshwater hatchetfishes, which are not particularly closely related Teleostei in the characiform family Gasteropelecidae.