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Telescope Focal Length Explained: Why Does It Matter? | StarLust
- https://starlust.org/telescope-focal-length/#:~:text=A%20longer%20focal%20length%20will%20shorten%20the%20field,objects%20as%20they%20are%20larger%20but%20dimmer%20targets.
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Astrophotography and Focal Length: - 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/
- 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
- 35mm is a popular focal length for street photography. A 35 to 50mm prime lens is small and unobtrusive, which is a good characteristic for taking candid photos. The Canon 40mm f/2.8 STM “pancake” lens has outstanding optical quality, is extremely discreet, and is only $125.
Telescope size, focal length and Astrophotography
- https://www.cloudynights.com/topic/358005-telescope-size-focal-length-and-astrophotography/
- Telescope size, focal length and Astrophotography - posted in Beginning Deep Sky Imaging: HelloFor quite a while I have been reading different opinions about the telescope size and focal length of telescope for astrophotography. My logic tells me that: 1. Bigger the telescope, much light gathering capabilities less exposure time. 2. Same telescope size …
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 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. It is "easier" to image at lower focal lengths.
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/
- Bjorn said it very well. If you are happy with your 8inch f/4 Newtonian, I wouldn't go to a longer focal length. 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.
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
- 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.
Use the 500 Rule for Astrophotography - AstroBackyard
- 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
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