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An apochromat, or apochromatic lens (apo), is a photographic or other lens that has better correction of chromatic and spherical aberration than the much more common achromat lenses. The prefix apo- comes from the Greek preposition ἀπό- , meaning free from or away from.
The Sigma 70-300mm F4-5.6 APO DG Macro lens is a consumer-level, telephoto zoom lens made by Sigma Corporation. [1] Different versions of this lens are produced that work with cameras from Canon, Nikon, Pentax, Konica Minolta, Sony and Sigma. Additionally, Olympus' 70–300 f/4–5.6 lens for Four-Thirds has the same optical design and ...
We pick the best lenses for astrophotography fans shooting a starry night sky, to suit a range of cameras and budgets The best lenses for astrophotography in 2022: fast ultra-wide lenses for the ...
A refracting telescope (also called a refractor) is a type of optical telescope that uses a lens as its objective to form an image (also referred to a dioptric telescope). The refracting telescope design was originally used in spyglasses and astronomical telescopes but is also used for long-focus camera lenses .
The Sigma APO 150-600mm F5-6.3 DG OS HSM lens is a super-telephoto lens produced by Sigma Corporation. It is actually a range of two slightly different lenses based on a common design: the Sports and Contemporary. Both lenses feature similar specifications, but there are some notable differences.
There are many techniques and pieces of commercially manufactured equipment for attaching digital single-lens reflex (DSLR) cameras and even basic point and shoot cameras to telescopes. Consumer-level digital cameras suffer from image noise over long exposures, so there are many techniques for cooling the camera, including cryogenic cooling ...
Sony A 70-200mm f/2.8 G SSM II. Originally developed and produced by Minolta as AF Apo Tele Zoom 70-200mm f / 2.8 G (D) SSM, then marketed by Sony as 70-200mm f / 2.8 G SSM (SAL-70200G) and updated as 70-200mm f / 2.8 G SSM II (SAL-70200G2), this lens is a professional full-frame lens compatible with cameras using the Minolta, Konica Minolta and Sony A-mount.
The J-3 camera on board the KH-4B spy satellite was planned to use a 24in f3.5 Petzval lens. [4] In 2013, Lomography successfully launched a crowdfunding campaign at kickstarter.com to produce a new Petzval lens in Russia for film and digital cameras. [5] Lensbaby offers Petzval lenses for modern cameras under the Burnside and Twist names. [6]
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