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Apochromatic lenses for astrophotography in the 60–150 mm aperture range have been developed and marketed by several firms, with focal ratios ranging from f /5 to f / 7. Focused and guided properly during the exposure, these apochromatic objectives are capable of producing the sharpest wide-field astrophotographs optically possible for the ...
A very bright star and very dark sky are required to produce highly contrasted spikes that are clearly visible. The diffraction effect is similar to producing sunstar patterns in landscape photography with ordinary camera lenses, where the mechanical iris of the lens is adjusted to a small polygonal shape with sharp corners.
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 ...
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.
Starting in 1988 with the release of the "i" series cameras, new lenses were released with an updated grip style featuring broader, rounded diagonal shapes and a rubber coated focus ring. These new lenses included 35–80 mm f /4–5.6 (with built-in lens cap), 80–200 mm f /4.5–5.6 , 35–105 mm f /3.5–4.5 , 70–210 mm f /3.5–4.5 , and ...
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.
Astrophotography is a popular hobby among photographers and amateur astronomers. Techniques ranges from basic film and digital cameras on tripods up to methods and equipment geared toward advanced imaging. Amateur astronomers and amateur telescope makers also use homemade equipment and modified devices.
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