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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…
Astrophotography - The '500 Rule' Chart - Shutter Muse
- https://shuttermuse.com/astrophotography-500-rule-chart/
- Sometimes we want star trails and sometimes we don’t. What’s the longest exposure you can use before you start to get a star trail? That depends on your sensor size and the focal length of your lens! This handy chart gives you the answer using the generally accepted ‘500 rule’. 500/(your focal length in 35mm terms).
Use the 500 Rule for Astrophotography | Useful Chart to …
- https://astrobackyard.com/the-500-rule/
- 500/ 50 / 1.5 = which will result in 7 seconds of exposure. The crop-factor for Canon cameras is almost the same as Nikon’s – 1.6. The formula should look like this: 500 / focal length / 1.6. Now, if you use the same 50mm lens, the formula would be: 500 / 50 / 1.6 = resulting in 6 seconds of exposure. Shutter Speeds
Astrophotography Exposure Table - ASTROCRUISE
- http://www.astrocruise.com/articles/film/astroexp.htm
- Astrophotography Exposure Table f/ratio. Low Elevation. Med Elevation. High Elevation : Unfiltered: Filtered: Unfiltered: Filtered: Unfiltered: Filtered: f/1.2: 56 sec: 2.2 min: 1.5 min: 3.6 min: ... This is a table for determining the approximate exposure times for deep space astronomical objects depending on the f/ratio of the optical system ...
A Few Words on Short Exposures for Astrophotography
- https://skyandtelescope.org/astronomy-blogs/imaging-foundations-richard-wright/short-exposures-astrophotography/
- The only way to overcome it is by taking longer exposures or stacking many short ones. If it takes one hour of signal collection to obtain a good image, you can instead combine 12 individual five-minute exposures. In theory, you can stack more shorter exposures. For example, 60 one-second exposures will accumulate the same amount of signal that ...
Astrophotography For Beginners: A Complete A-Z Guide …
- https://nightskypix.com/beginners-guide-to-astrophotography/
- Let’s use a Rokinon 14mm f/2.8 lens on a full-frame DSLR camera for an example. You divide 500 by 14 (14mm Focal Length), which equals 35.71 seconds. Round it down a little and 35 seconds is the shutter speed (exposure) you should use …
Finding the Optimal Sub-frame Exposure - Astrophotography
- https://www.cloudynights.com/articles/cat/articles/astrophotography/finding-the-optimal-sub-frame-exposure-r1571
- This paper discusses the issues of noise from all sources in astrophotography and attempts to find the optimal sub-frame exposure length from both the mathematics and empirical data. The current wisdom of simply overwhelming camera noise with light pollution noise as the optimal sub-frame exposure is found to be false.
Optimum Exposures Calculator - Gibraltar Astronomical …
- http://www.gibastrosoc.org/sections/astrophotography/optimum-exposures-calculator
- 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 …
Calculators for Astrophotography
- https://www.astropix.com/html/astrophotography/astrophotography-calculators.html
- Calculators already have sample data in them. Some are examples from my telescope, a C11 SCT with 279.4 mm of aperture and 2,794 mm focal length at f/10. Highlight the numbers already entered in the boxes and delete them and enter your own. For large numbers, do not use commas. Formulae used for these calculators.
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.
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