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Astrophotography: How to Photograph the Stars - PetaPixel
- https://petapixel.com/2018/12/08/astrophotography-how-to-photograph-the-stars/#:~:text=You%20want%20to%20use%20a%20long%20exposure%20time,star%20trails%2C%20then%20use%20the%20rule%20of%20600.
- none
Astrophotography and Exposure, Clarkvision.com
- https://clarkvision.com/articles/astrophotography.and.exposure/
- For widely varying focal lengths where you want to record a similar light density, include thepixel angular area. This is CEFA: Clark Exposure Factor Angular area, CEFA = aperture area in square centimeters * exposure times in minutestimes angular area in arc-seconds. CEFA = (pi/4) * (aperture diameter in cm)2* time in minutes * angul…
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.
Use the 500 Rule for Astrophotography | Useful Chart to …
- 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 seconds (0.0042*21). 0.1 degrees = 7.3 pixels with this kind of a camera (81.4*0.1).
Astrophotography: How Long Can You Go? - Sky
- https://skyandtelescope.org/astronomy-blogs/imaging-foundations-richard-wright/astrophotography-rule-of-500-how-long/
- While many astrophotographers follow the “rule of 500” (or 300), some experimentation can help find the right exposure time for your setup. When a child is taught to ride a bike, we often put training wheels on the back; they straddle the rear wheel to ensure the bike cannot tip over while the child learns to keep their balance.
A Few Words on Short Exposures for Astrophotography
- https://skyandtelescope.org/astronomy-blogs/imaging-foundations-richard-wright/short-exposures-astrophotography/
- If you make a sequence of images of a bright star, with one second exposure, you get a star image with a given diameter, if you decrease the time to 1/10th of a second, the star image is smaller, at 1/100th (10ms) the image is very sharp (at least the pack of speckles is smaller), but dancing all over the place (giving the larger diameter one got with 1 second …
DSLR Astrophotography 101: Exposure Settings | OPT
- https://optcorp.com/blogs/astrophotography-101/exposure
- The old days of film photography brought us a formula for exposure, though outdated, that somewhat works with our modern practices and camera designs. The formula is500 divided by focal length ≈ longest exposure time in seconds w/o streaking stars (500/ (focal length) ≈ exp. in seconds). This is called the500 Rule.
Optimum Exposures Calculator - Gibraltar Astronomical …
- http://www.gibastrosoc.org/sections/astrophotography/optimum-exposures-calculator
- Astrophotography can seem like a fair bit of guess-work. In general the process of capturing images involves doing so at a certain exposure length and multiple times for the same target, using the same filter. The idea here being to combine the images captured during calibration in order to reduce the pronunciation of noise and increase the ...
More short exposures or fewer long exposures
- https://www.amateurastrophotography.com/more-short-exposures-or-fewer-long-exposures-which-is-better/
- For example, you can take 12 subs at 10 seconds each, giving a total exposure time of 120 seconds. Or you can collect the same overall exposure time by using fewer long exposures e.g. 2 subs at 60 seconds each (again totaling 120 seconds).
Formula to Calculate max exposure time. - Cloudy Nights
- https://www.cloudynights.com/topic/709111-formula-to-calculate-max-exposure-time/
- 1. Exposure time will depend on many factors. Darkness of the site. Moon on/off. Gain of the camera, etc. Just take a test shot and look at the histogram. You want the histogram peaks to be in the first half of the range. My exposure times with AT72EDII and ASI294 (Gain 200, offset 20) with a LPro filter vary from 60 to 360 sec for a single frame.
Why use exposure time over 30 seconds?: …
- https://www.dpreview.com/forums/thread/4472350
- Read noise is cumulative, and can't be erased. I typically shoot 4-7 minute exposures, at 420mm to 800mm. I typically shoot for at least 3 hrs minimum total exposure time. Your total exposure would be the same, but you would have 600X more read noise in …
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