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The APO version has a red ring on the end of the lens body to distinguish it from the non-APO version of the lens, the Sigma 70-300mm F4-5.6 DG Macro. [3] This lens has 14 elements in 10 groups including two special low dispersion glass elements in the front lens group, and one in the rear lens group. [1] The non-APO version has only one such ...
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 ...
Business Insider's BI Intelligence expects an annual sales of 21 million Google Glass units by 2018. [70] [71] [72] Samsung and Microsoft are expected to develop their own version of Google Glass within six months with a price range of $200 to $500. Samsung has reportedly bought lenses from Lumus, a company based in Israel.
Adjustable focus lenses, like single-focus lenses, also reduce image-jump and spatial distortion in the field of view associated with traditional multi-focal lenses. Additionally, the ideal near-vision correction can be achieved with precision, because the variable lenses emulate the focusing action of the youthful (non-presbyopic) eye.
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A zoom lens is a system of camera lens elements for which the focal length (and thus angle of view) can be varied, as opposed to a fixed-focal-length (FFL) lens . A true zoom lens or optical zoom lens is a type of parfocal lens, one that maintains focus when its focal length changes. [1]
70-200mm Maximum aperture: f / 2.8 Minimum aperture: f / 22 Weight 1430g / 50.4oz Dimensions (Approx.) 86.4mm x 197.6mm /3.4in. x 7.8in. (Diameter x Length) Diaphragm Blades 9 Filter diameter 77mm Maximum Magnifications 1:8| Minimum Focusing Distance 140cm / 55.1in. Supplied Accessories LH850-02 589 Hood Case 77mm lens cap Rear lens cap RRP ...
Sony Alpha 55 with Minolta 70–210mm f / 4. It was introduced in 1985 at the launch of the Minolta Maxxum/Dynax/Alpha 7000 camera (the first widely successful autofocus SLR) and remained in production for many years. Two years earlier, the lens had been introduced as a one-touch zoom in the manual-focus Minolta SR mount (as a "plain
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