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Thanks Greg,
Good point about changes in the image train.
I use APT and its Flats Aid Tool is pretty good ( I use Flats and Bias for the 2600MC so will do the same for the new 2600MM ( similar cameras as far as flats go )
Most folk take their flats at the end of an image session which I currently do with OSC but what happens if you have micro changes in focus between filters on a nights imaging run. "Theoretically" you should take flats for each filter between filters ?? This would take a significant amount of time as you would have to move your scope back to park and point it to zenith ( I use a flat panel ) this seems totally impractical ?
My new Antlia LRGB and Ha Oiii and Sii Mono filters are suppose to be Parfocal but as we know focus can shift slightly through the night ( even through one filter )
Your thoughts and experience
Cheers
Martin
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