Looking through the many "What is the ideal exposure" threads, I thought I would look into the PI Scripts/Instrumentation/Calculate Sky Limited Exposure Script
After a few sessions of google, I really found no documentation of what it all means. It refers to the Anstey limits, and I read through the Anstey article (and lots of other stuff). I really found nothing that would help with what I wanted to know.
How does one get something out of the Script.
Camera input box looks pretty easy.....just identify your camera.
Background Image---Still pretty easy.....looks like I identify which image I want to analyze. SO, I take a sample image of what I think will be good, and identify that in the pull-down. The script goes into the FITS header, I assume, and gets the information it needs. Is that right so far? What else needs to be done? Do I need to change those parameters?
Options: Again pretty easy, and the context hints are helpful. Except for that "Total Exposures." Are they asking me to input how many seconds overall I have to devote to the image? Say I want to gather an hour of data----I put in 3600? If I want two hours, I put in 7200?
Results: Here it gets tricky.....I assume the "Background Flux" is what the script determines is the overall background.
THen I cannot figure out what the other three elements are telling me?
What is the Limit 1? Limit 2? Anstey Limit? I mean......which of those is the length of the ideal exposure?
I would appreciate any help you can give out there. Including directing me to a source where this is explained.