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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.
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.
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 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 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 …
What focal length is best for astrophotography? - Quora
- https://www.quora.com/What-focal-length-is-best-for-astrophotography
- Answered 1 year ago · Author has 3.2K answers and 1.4M answer views. It depends on what you’re taking a picture of. If you’re taking a picture of the Moon you want a zoom lens with a maximum focal length of at least 200 mm, 300 is better and 400 mm or bigger is best. Zoom lens with a maximum focal length of 400 mm or more are incredibly expensive, like 2,000 dollars or …
Focal Lengths and Deep Sky Astrophotography - PBase
- https://www.pbase.com/samirkharusi/focal_lengths
- IMHO nothing beats camera lenses and DSLRs for pleasant portable (and unguided!) astrophotography :-) All but two of the images below were shot unguided. The only ones that were autoguided are the two images (M45 and M42) using 5-minute subs and 600mm+1.4x tele-extender (840mm focal length at f5.6).
Which long focal lengths make sense for the average astro …
- https://www.astrobin.com/forum/c/astrophotography/equipment/which-long-focal-lengths-make-sense-for-the-average-astro-photographer/
- With 2.4um pixel (ASI183) you have 0.6arcsec/pix (equal to the diffraction limit at 200mm) and a longer focal length won't hep. Even with 3.7um pixels you have 1arcsec/pix, ideally suited for 2arcsec seeing. If I had an 8inch f/4 Newtonian, I would probably to look to invest in my imaging train first.
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).
Best lenses for astrophotography | Space
- https://www.space.com/best-lenses-for-astrophotography
- This lens has more than a passing resemblance to the fixed 14mm focal length of Sigma’s 14mm f/1.8 DG HSM Art but has the added benefit of boasting a zoom range from 14mm through to 24mm.
How Do I Decide on Focal Length for Astrophotography?
- https://photography-on-the.net/forum/showthread.php?t=1454184
- Typically it should be at least 1/3rd of the focal length (1/2 of the focal length would be even better.) That means if you had, say, a 600mm focal length imaging scope, then you'd want your guide scope to be at least 200mm.
Use the 500 Rule for Astrophotography | Useful Chart to …
- https://astrobackyard.com/the-500-rule/
- 500 / Crop-Factor x Focal Length = Ideal Shutter Speed. Here is an example of the formula used with my Canon EOS 60Da (APSC-C sensor) camera and a 50mm F/1.8 camera lens: 500 / 1.6 (Crop-Factor) x 50 (focal length of my lens) = 6.25-seconds ... The Canon EF 24-105mm F/4L is an excellent lens for astrophotography. (photos shown used a star ...
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