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Exposure calculator
#3
Hello,

It is very important that every aspect of your imaging system and location be set up properly. So if you are not getting the results that you expect, it is likely because something isn't set up correctly. A one-second sub exposure is very short under most conditions, but if you have a bright sky (location sky brightness setting) or moonlight, fast optical system, and certain cameras, this might be the correct result. But as I said, such short exposure times are unusual. So make sure to check your settings and that the moon isn't up.

More importantly, you didn't say anything about your target object. Is it a bright star? Bright objects may require a short exposure in order to avoid saturation or clipping of the detector.

Where are you seeing these short exposure times? Note that the ideal exposure time listed in the table has limited value. Let the calculator part automatically compute the best sub exposure time.

Lastly, the Exposure Calculator is there for you to experiment with or to make decisions for special cases. In practice, you should use the other tools. When making an imaging project, the Exposure Goals tab has a table that summarizes how long you will need to expose to reach your target SNR under ideal conditions.

Ultimately it is the Scheduler or Real Time tools that are used to calculate the sub exposure times when you are ready to start observing.
Clear skies,
Greg

SkyTools Developer
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Messages In This Thread
Exposure calculator - by CrzHrs - 2019-01-09, 08:50 AM
RE: Exposure calculator - by PMSchu - 2019-01-09, 06:20 PM
RE: Exposure calculator - by theskyhound - 2019-01-09, 06:31 PM
RE: Exposure calculator - by CrzHrs - 2019-01-10, 01:33 PM

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