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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 to Focus your Camera For Astrophotography
- https://astrobackyard.com/how-to-focus-astrophotography/
- A typical astrophotography telescope setup with a dual-speed (Crayford-style) focuser. You’ll likely find it easier to focus a refractor telescope on a bright star than a camera lens. The focuser moves much slower, and you’ll make several rotations of the focuser knob rather than the small turns of a camera lens focus ring.
How to Choose the Best Focal Ratio for Astrophotography
- https://starrynova.com/best-focal-ratio-for-astrophotography/
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Astrophotography Image Processing, Clarkvision.com
- https://www.clarkvision.com/articles/astrophotography.and.focal.length/
- At around 200 mm focal length, images show details in the classic large deep sky objects, such as the Horsehead nebula and the Great Orion nebula in Figure 2. This focal length is goo for recording the many star fields and dusty regions in the Milky way. Figure 2. 200 mm f/2.8 lens, 1.3x crop camera, 25.4 minutes of exposure at a dark site.
How Focal Ratio Affects Your Astro Images - Sky
- https://skyandtelescope.org/astronomy-blogs/imaging-foundations-richard-wright/how-focal-ratio-affects-your-astro-images/
- 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 astrograph (a telescope designed for astrophotography) that has a focal length of 400 mm will have a focal ratio of f/2. Both telescopes collect the same amount of light, but the latter produces a much brighter image of your target.
Best lenses for astrophotography | Space
- https://www.space.com/best-lenses-for-astrophotography
- The useful constant aperture of f/2.8 is ideal for astrophotography, as is the focal range, allowing the user 20mm of flexibility to play with in the field.
Astrophotography focal length. - Refractors - Cloudy Nights
- https://www.cloudynights.com/topic/442457-astrophotography-focal-length/
- Arc-sec / pixel = 206* (pixel width in microns) / (focal length in mm) Presto! If our pixels are 4.5 microns we can match 2.5 arc-sec seeing FWHM with a focal length of 740mm, but with the older CCDs having 9 micron pixels a matching focal length was 1480mm.
Astrophotography Equipment - Basic Setup for Deep-Sky …
- https://astrobackyard.com/astrophotography-equipment/
- Focal Length: 480mm; Diameter: 85mm; Focal Ratio: f/6; Weight: 7.5lb; Dovetail: Vixen; Perfect for astrophotography. There are several things I love about this telescope. Weighing in at 7.5 lbs, and including a high-quality aluminum padded case with a handle, this refractor is a breeze to transport. I also love the consistency of the images it produces.
The Best Lens for Astrophotography (That You Probably …
- https://astrobackyard.com/budget-astrophotography-lens/
- These 2 lenses are tremendous choices for astrophotography because they are capable of letting in a lot of starlight in a single exposure. The 50mm is a useful focal length for framing up a particular constellation like Orion, above. While the Rokinon 14mm lens is perfect for shooting the Milky Way.
In Astrophotography, Bigger Is Not Always Better! - Sky
- https://skyandtelescope.org/astronomy-blogs/imaging-foundations-richard-wright/astrophotography-bigger-not-better/
- Long focal-length, deep-sky astrophotography (starting around 2,000 mm) is best done from outer space, or when you're well along the challenging learning curve. There are many compact, long-focal-length telescopes on the market for visual observers (think Schmidt-Cassegrains and Maksutov-Cassegrains).
Framing Your Astro Image: Understanding Field of View …
- https://skyandtelescope.org/astronomy-blogs/imaging-foundations-richard-wright/understanding-field-of-view-pixel-scale/
- Focal length and sensor size work together to determine the exact area of sky you can image. If you know the width of your imaging chip and focal length of your optic in millimeters, you can compute the field of view yourself: Field of view in arc minutes = (width of chip * 3460) / (focal length of optic)
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