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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/
- The key to astrophotography is light — the more, the better. And one of the keys to understanding light, and how to collect more of it, is the focal ratio: the focal length of your optic divided by its aperture. Capture More Light, …
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 …
What Does Focal Ratio Mean In Telescopes? The Simple …
- https://backyardstargazers.com/what-does-focal-ratio-mean-in-telescopes/
- While not as important for casual viewing, the focal ratio can have a profound impact on astrophotography. Getting good shots of different objects is going …
Astrophotography and F ratio - Cloudy Nights
- https://www.cloudynights.com/topic/469323-astrophotography-and-f-ratio/
- Posted 15 July 2014 - 01:15 PM. The f/ratio is of importance for extended objects, and particularly when faint. Image surface brightness scales as the inverse of the f/ratio squared. For example, f/4 image surface brightness is 4X higher than at f/8. This improves signal to camera noise, and shortens exposure times.
What the “f/ratio” Means in Telescope Lingo
- https://telescopeschool.com/what-the-f-ratio-means-in-telescope-talk/
- Ad: AstronomyWear.com. The f/ratio in photography means the same for telescopes. It is the f ocal length of the telescope divided by its aperture. One of the most common telescope designs is a 120mm aperture (4.7”) refractor with a focal length of 1 meter (1000mm).
6 Best Telescopes for Astrophotography in 2022 - Shotkit
- https://shotkit.com/best-telescope-astrophotography/
- A focal ratio between f/11 and f.15 is ideal for photographing bright objects like the moon, planets, and binary stars – the kind of incredible imagery you might have seen on sites like Astrobin. Focal ratios between f/6 to f/10 are good all-rounders: versatile enough for photographing bright planetary bodies as well deep-sky objects. Focal Length
Astrophotography: Picking Your Pixels - Sky & Telescope
- https://skyandtelescope.org/astronomy-blogs/imaging-foundations-richard-wright/astrophotography-pick-your-pixels/
- For longer focal-length telescopes, you really need larger pixels to achieve proper sampling and a good signal-to-noise-ratio per pixel. Fast focal ratios and short focal lengths like on this f/2 eight-inch RASA are a great match for small pixels Richard S. Wright Jr. Small Pixels Rule. Small pixels aren't always bad.
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
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