ive been watvhing vids on doing flats darks etc etc..
my only question is what kind of exposure times and gain settings are you guys using with uvir filters and with the l enhance Lpro light pollution type filters
i assume they all need different exposure times..or what am i looking for when i take a test exposure
i also assume there is such a thing as over and underexposure\
generally i jump in head first but like to get some info on where to start...why start with blinders on if i dont have to you know
Here's an excellent start. Proper exposure depends (a whole lot) on your light pollution level, and optical speed (F number). More light pollution, more optical speed, less exposure. The tables below will give you a clue. See how much proper exposure varies with those things. A great deal. From less than 10 seconds to 15 minutes.
Note that the tables don't say anything about your target. Adjusting exposure for different targets is an expert tweak, ignore that for now.
They're for the 183 mono camera. For color, multiply the exposures by 3. For the LEnhance and color, multiply by 10. Ignore the narrowband tables.
I don't recommend the LPro. The LEnhance should only be used on emission nebulae.
Likely it's best to avoid filters altogether until you've done some imaging. They complicate things, and are far from perfect. The 183MC, which I own, has a built in UV/IR cut.
BUT. You really need to take and use the camera calibration frames; bias (the 183 doesn't need dark flats), flats, darks. From the very start. Without any one of those you are very likely to see very annoying extra light, not related to your target. It's called "amp glow". With the 3 camera calibration frames, done and used properly, it disappears.
Edited by bobzeq25, 24 October 2021 - 12:19 AM.