enow.com Web Search

Search results

1. Results from the WOW.Com Content Network

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. 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 ...

4. 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 Skip to main content. Sign in. Mail. 24/7 Help. For premium support please ...

5. Sigma 150-600mm f/5-6.3 DG OS HSM lens - Wikipedia

   en.wikipedia.org/wiki/Sigma_150-600mm_f/5-6.3_DG...

   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.

6. 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.

7. List of largest optical refracting telescopes - Wikipedia

   en.wikipedia.org/wiki/List_of_largest_optical...

   Yale-Columbia Refractor Yale Southern Station: Johannesburg, Union of South Africa: Relocated 1952: 66 cm (26") 10.8 m: 1925–1952: Yale-Columbia Refractor moved to Mount Stromlo Observatory in 1952, same telescope as following entry. Yale-Columbia Refractor Mount Stromlo Observatory: Mount Stromlo, Australia: Destroyed 2003: 66 cm (26") 10.8 ...

8. Coma (optics) - Wikipedia

   en.wikipedia.org/wiki/Coma_(optics)

   Coma of a single lens. Each cone of light focuses on different planes along the optical axis. In optics (especially telescopes), the coma (/ ˈ k oʊ m ə /), or comatic aberration, in an optical system refers to aberration inherent to certain optical designs or due to imperfection in the lens or other components that results in off-axis point sources such as stars appearing distorted ...

9. List of Leica lenses - Wikipedia

   en.wikipedia.org/wiki/List_of_Leica_lenses

   Leica 800mm f /6.3 Telyt-S – 1972–1995 (sold, during a promotional campaign, with a "free tripod" — a VW Fox) Leica modular APO-Telyt-R 260/400/560 head Leica modular APO-Telyt-R 400/560/800 head