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  2. List of Sony E-mount lenses - Wikipedia

    en.wikipedia.org/wiki/List_of_Sony_E-mount_lenses

    Sony Lens Adapter E/A 2 2011 Mount adapter APS-C 200g LA-EA2 for A-mount lenses on E-mount camera, SLT-PD-AF with all AF lenses. Sony Lens Adapter E/A 3 2013 Mount adapter 35mm 110g LA-EA3 for A-mount lenses on full-frame E-mount camera, glass-less, CD-AF / OS-PD-AF with SSM/SAM lenses only. [41] Sony Lens Adapter E/A 4 2013 Mount adapter 35mm

  3. Mamiya 645 - Wikipedia

    en.wikipedia.org/wiki/Mamiya_645

    Early "S" lenses may have gold "S" stickers on them, while later "S" lenses may have the "S" engraved. "S" lenses may also be called "CS" lenses. [1] SF — the lens has a separate control ring to create a Soft Focus effect. [13] ULD — the lens has “ultra low dispersion” glass in its design [1] Zoom — the lens has a variable focal ...

  4. Canon EF-M lens mount - Wikipedia

    en.wikipedia.org/wiki/Canon_EF-M_lens_mount

    As it is designed for use with an APS-C-sized image sensor, it features the same crop factor (of roughly 1.6) as the existing EF-S lens mount. The M system is somewhat limited as Canon has issued relatively few native lenses, listed below. There is a lack of native lenses with a large aperture, the exceptions being 22 mm f / 2.0 and 32 mm f / 1 ...

  5. .475 Wildey Magnum - Wikipedia

    en.wikipedia.org/wiki/.475_Wildey_Magnum

    The .475 Wildey Magnum was designed to be a hunting round. Cases are formed from .284 Winchester brass with the neck cut down and widened to take a .475-inch bullet, and the length is the same as the .45 Winchester Magnum. Velocity at 100 yards is equivalent to the muzzle velocity of the .44 Magnum. [2] [3] [4]

  6. Eyepiece - Wikipedia

    en.wikipedia.org/wiki/Eyepiece

    An eyepiece, or ocular lens, is a type of lens that is attached to a variety of optical devices such as telescopes and microscopes. It is named because it is usually the lens that is closest to the eye when someone looks through an optical device to observe an object or sample.

  7. M squared - Wikipedia

    en.wikipedia.org/wiki/M_squared

    M 2 is useful because it reflects how well a collimated laser beam can be focused to a small spot, or how well a divergent laser source can be collimated. It is a better guide to beam quality than Gaussian appearance because there are many cases in which a beam can look Gaussian, yet have an M 2 value far from unity. [1]

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