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How to Choose the Best Focal Ratio for Astrophotography
- https://starrynova.com/best-focal-ratio-for-astrophotography/#:~:text=An%20ideal%20focal%20ratio%20for%20this%20type%20of,when%20you%20don%E2%80%99t%20know%20what%20to%20look%20for.
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How Focal Ratio Affects Your Astro Images - Sky
- https://skyandtelescope.org/astronomy-blogs/imaging-foundations-richard-wright/how-focal-ratio-affects-your-astro-images/
- Why Focal Ratio Matters. The tradeoff between aperture and focal length is reflected in the instruments focal ratio. A 200-mm (8-inch) telescope with a 2,000-mm focal length has a focal ratio of f/10. By contrast a 200-mm …
How to Choose the Best Focal Ratio for Astrophotography
- https://starrynova.com/best-focal-ratio-for-astrophotography/
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Focal Ratio | Astronomics.com
- https://www.astronomics.com/info-library/astronomical-terms/focal-ratio/
- Fast f/4 to f/5 focal ratios are generally best for lower power wide field observing and deep space photography. Slow f/11 to f/15 focal ratios are usually better suited to higher power lunar, planetary, and binary star observing and high power photography. Medium f/6 to f/10 focal ratios work well with either.
Astrophotography, Pixel by Pixel: Part 2 - Focal Ratio Effects
- https://cloudbreakoptics.com/blogs/news/astrophotography-pixel-by-pixel-part-2
- While aperture cannot be completely ignored in astrophotography, often what we care about more is the focal ratio of the telescope. The focal ratio is a unitless number, and can be found by dividing the focal length of the telescope by the aperture. For example, if a telescope had 80mm of aperture and a focal length of 500mm, then the focal ratio of the scope would be …
Astrophotography and F ratio - Beginners Forum (No
- https://www.cloudynights.com/topic/469323-astrophotography-and-f-ratio/
- Here's the way I think about it.. Astronomers think in aperture(diameter) and focal length or focal ratio. Photographers (not me) think in terms of focal ratio and focal length. Consider two telescopes: A 100mm aperture with a 1000mm focal length = F/10 A photographer thinks of this as 1000mm F/10 lens.
What Does Focal Ratio Mean In Telescopes? The Simple …
- https://backyardstargazers.com/what-does-focal-ratio-mean-in-telescopes/
- The Usefulness Of The Focal Ratio. The focal ratio is used to determine the “speed” of a telescope. The closer the focal ratio number is to 1 the “faster” the telescope is. For example, if you are looking at a distant nebula through a telescope with a focal ratio of 4, you will see it much faster than through a telescope with a focal ratio of 8 but the image will be smaller and less …
Astrophotography Formulae
- https://astropix.com/html/astrophotography/astrophotography-formulae.html
- Focal Ratio from Aperture and Focal Length. Focal Ratio = Focal Length / Aperture. f = F / d. Where: f = focal ratio; F = focal length; D = aperture; F and D should be in the same units, such as millimeters or inches. Example: A Celestron C11 has an aperture of 11 inches and a focal length of 110 inches. f = F / d. f = 110 / 11. f = 10
Why Aperture is so Important in Astrophotography
- https://www.photographingspace.com/aperture-is-important/
- The focal ratio is the f-stop or the focal length divided by the diameter of the aperture. I think you meant. The aperture diameter for a particular lens is a measure of the focal length of the lens divided by the focal ratio or f-stop. A lens with a 1000mm focal length and focal ratio of 5 would have a aperture diameter of 200mm.
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