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  2. Canon MP-E 65mm f/2.8 1–5x Macro - Wikipedia

    en.wikipedia.org/wiki/Canon_MP-E_65mm_f/2.8_1...

    The MP-E65mm f/2.8 1-5x Macro Photo is a photographic lens that was released in September 1999 and was discontinued in 2023. It was manufactured by Canon for use on the EOS photographic system. It is a manual focus lens for the EF mount and is specifically designed for macro photography .

  3. 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:

  4. Zograscope - Wikipedia

    en.wikipedia.org/wiki/Zograscope

    According to Michael Quinion, the origin of the term is lost, but it is also known as a diagonal mirror, as an optical pillar machine, or as an optical diagonal machine. [ 2 ] In Japan, the zograscope became known as 和蘭眼鏡 ( Oranda megane , 'Dutch glasses') or 覗き眼鏡 ( nozoki megane 'peeping glasses'), and the pictures were known ...

  5. f-number - Wikipedia

    en.wikipedia.org/wiki/F-number

    where N is the uncorrected f-number, NA i is the image-space numerical aperture of the lens, | | is the absolute value of the lens's magnification for an object a particular distance away, and P is the pupil magnification. Since the pupil magnification is seldom known it is often assumed to be 1, which is the correct value for all symmetric lenses.

  6. Telecentric lens - Wikipedia

    en.wikipedia.org/wiki/Telecentric_lens

    Bi-telecentric lens with 208 mm diameter front element and a C-mount camera interface 3D render simulating a photo taken with a fixed focal length and a telecentric lens. A telecentric lens is a special optical lens (often an objective lens or a camera lens) that has its entrance or exit pupil, or both, at infinity.

  7. 40 Gifts That Cost $40 or Less From Oprah’s 2024 Favorite ...

    www.aol.com/finance/40-gifts-cost-40-less...

    These stylish blue light-blocking glasses are available in four colors and can be purchased with or without magnification ... This makeup bag features a light-up mirror that ... Editor’s note ...