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Example of Bahtinov mask Operation of a Bahtinov mask for refracting optics, showing that rotating it 180° reverses the direction of the pattern. The Bahtinov mask is a device used to focus small astronomical telescopes accurately.
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.
Field flattener a correcting lens used to reduce field curvature in refracting telescopes for astrophotography. Barlow lens: Optical element to increase the telescope's focal length and magnification, narrow the field of view and reduce coma distortion, providing opposite effects of a telecompressor.
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 ...
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 ...
Some famous 19th century doublet refractors are the James Lick telescope (91 cm/36 in) and the Greenwich 28 inch refractor (71 cm). An example of an older refractor is the Shuckburgh telescope (dating to the late 1700s). A famous refractor was the "Trophy Telescope", presented at the 1851 Great Exhibition in London.
Ultraviolet filters for protecting a camera from ultraviolet radiation. An astronomical filter is a telescope accessory consisting of an optical filter used by amateur astronomers to improve the details and contrast of celestial objects, either for viewing or for photography.
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.
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