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2. 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.

3. 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.

4. 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.

5. 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 ...

6. List of telescope parts and construction - Wikipedia

   en.wikipedia.org/wiki/List_of_telescope_parts...

   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.

7. Killarney Provincial Park Observatory - Wikipedia

   en.wikipedia.org/wiki/Killarney_Provincial_Park...

   In 2018, the new Observatory was opened and houses a Meade LX600-ACF 16" f/8 (ideal for planets and deep sky astrophotography) with a Meade Series 6000 130mm ED APO refractor mounted on top for lower magnification / wide field use. The entire assembly sits on a cast steel Permanent Equatorial Pier to ensure overall stability and consistency of ...