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Kait Photography

Brisbane based photographer

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Astrophotography Focal Length Exposure Time

Interested in photography? At kaitphotography.com.au you will find all the information about Astrophotography Focal Length Exposure Time and much more about photography.


Long Exposure Vs Image Stacking For Astrophotography

    https://nightskypix.com/astrophotography-stacking-vs-long-exposure/#:~:text=Typically%2C%20a%20star%20trail%20requires%20exposing%20the%20sky,and%20digital%20noise%20will%20likely%20become%20a%20problem.
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Astrophotography: How Long Can You Go? - Sky

    https://skyandtelescope.org/astronomy-blogs/imaging-foundations-richard-wright/astrophotography-rule-of-500-how-long/
    If you've never heard of the Rule of 500, it's quite simple. When taking an untracked photo of the night sky using a camera on a tripod, this rule tells you how long you can expose before the stars begin to trail. You take the number 500 and divide by the focal length of your lens. For example, if you have a 20-mm wide angle lens, then 500 / 20 = 25.

Astrophotography and Exposure, Clarkvision.com

    https://clarkvision.com/articles/astrophotography.and.exposure/
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DSLR Astrophotography 101: Exposure Settings | OPT

    https://optcorp.com/blogs/astrophotography-101/exposure
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Astrophotography Image Processing, Clarkvision.com

    https://www.clarkvision.com/articles/astrophotography.and.focal.length/
    A 300 mm focal length lens with a camera with 4.1 micron pixels, resolves 2.8 arc-seconds per pixel. It is hard to actually record more detail than about 2 arc-seconds in long exposures due to atmospheric turbulence. Thus, it …

Use the 500 Rule for Astrophotography - AstroBackyard

    https://astrobackyard.com/the-500-rule/
    With this kind of lens, the exposure time will be about 21 seconds according to the 500 rule (500/24). The sky will move about 0.09 degrees during these 21 …

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.

Exposure Times — Starizona

    https://starizona.com/blogs/tutorials/exposure-times
    The exposure time was 20 minutes. If your telescope has a focal ratio of f/10, you need an exposure of 40 minutes to get the same results, because f/10 is half as fast as f/7. However, the other factors do come into play. To determine a more accurate exposure time, use the calculator below.

Please explain focal ratio vs. exposure time - Cloudy Nights

    https://www.cloudynights.com/topic/402510-please-explain-focal-ratio-vs-exposure-time/
    Assuming the same camera, in all different configurations, exposure time changes with F-Ratio, resolution changes with focal length. Double the F-Ratio, 4x the exposure time, independant of aperture. 4 inch F/5 and 16 inch F/5 will require the same exposure times, but the 16 inch will have greater resolution (due to longer focal length).

Calculating Correct Exposure for Astrophotography Sub …

    https://www.dpreview.com/forums/thread/4377640
    Consider two lens, both f/2, with focal length of 100mm and 200mm respectively. The lens with 200mm focal length has twice the aperture diameter and four times the area of the other; but it also receives light from a quarter of the sky area. The increased sky area exactly cancels out the reduced aperture area. Andy

Finding the Optimal Sub-frame Exposure - Astrophotography

    https://www.cloudynights.com/articles/cat/articles/astrophotography/finding-the-optimal-sub-frame-exposure-r1571
    From Equation 6 we know that we need to overwhelm the second term by 4.38 to achieve the optimal exposure so that means we should expose for 4.38*20 minutes = 87.6 minutes, longer than the 60 minutes maximum exposure of an SBIG camera.

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