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2. Binoculars - Wikipedia

   en.wikipedia.org/wiki/Binoculars

   The larger front lenses in the 8×40 also produce wider beams of light (exit pupil) that leave the eyepieces. This makes it more comfortable to view with an 8×40 than an 8×25. A pair of 10×50 binoculars is better than a pair of 8×40 binoculars for magnification, sharpness and luminous flux. Objective diameter is usually expressed in ...

3. Carl Zeiss AG - Wikipedia

   en.wikipedia.org/wiki/Carl_Zeiss_AG

   First workshop of Carl Zeiss in the center of Jena, c. 1847 Carl Zeiss Jena (1910) One of the Stasi's cameras with the special SO-3.5.1 (5/17mm) lens developed by Carl Zeiss, a so-called "needle eye lens", for shooting through keyholes or holes down to 1 mm in diameter 2 historical lenses of Carl Zeiss, Nr. 145077 and Nr. 145078, Tessar 1:4,5 F=5,5cm DRP 142294 (produced before 1910) Carl ...

4. Helios (lens brand) - Wikipedia

   en.wikipedia.org/wiki/Helios_(lens_brand)

   Helios 103 53 mm f/1.8 with lens hood mounted on Kiev 4M In the early 80s the design of the jumping diaphragm mechanism has been upgraded to improve its reliability. Now the aperture control mode switch has disappeared from the lens barrel, which did not arouse the delight of amateur photographers.

5. M42 lens mount - Wikipedia

   en.wikipedia.org/wiki/M42_lens_mount

   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. (The M42 lens mount should not be confused with the T-mount , which shares the 42 mm throat diameter, but differs by having a 0.75 mm thread pitch.)

6. NOBLEX E-Optics GmbH - Wikipedia

   en.wikipedia.org/wiki/NOBLEX_E-Optics_GmbH

   A year after the German reunification, the Eisfeld plant of the Jenoptik Carl Zeiss Jena GmbH, which employed 550 staff, was taken over by Bernhard Docter, who lent his name to the company and products. The company now traded under the name Docter-Optic-Eisfeld GmbH and continued with the production of binoculars, riflescopes, spotting scopes ...

7. f-number - Wikipedia

   en.wikipedia.org/wiki/F-number

   A 100 mm focal length f /4 lens has an entrance pupil diameter of 25 mm. A 100 mm focal length f /2 lens has an entrance pupil diameter of 50 mm. Since the area is proportional to the square of the pupil diameter, [6] the amount of light admitted by the f /2 lens is four times that of the f /4 lens.