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2. Apochromat - Wikipedia

   en.wikipedia.org/wiki/Apochromat

   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.

3. The best lenses for astrophotography in 2022: fast ... - AOL

   www.aol.com/news/best-lenses-astrophotography...

   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 ...

4. Bahtinov mask - Wikipedia

   en.wikipedia.org/wiki/Bahtinov_mask

   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.

5. Sigma 70-300mm f/4–5.6 APO DG Macro lens - Wikipedia

   en.wikipedia.org/wiki/Sigma_70-300mm_f/4–5.6...

   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 ...

6. Refracting telescope - Wikipedia

   en.wikipedia.org/wiki/Refracting_telescope

   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.

7. Astrophotography - Wikipedia

   en.wikipedia.org/wiki/Astrophotography

   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.