|
I agree. It depends on dust motes. You may have dust on one colour filter and not another that may show up and wreck an image. They are very hard to remove in post processing.
The best policy with regards to flats and filters is to keep your optics and filters clean and try not to change them over. I am wanting to swap from a 5 position filter wheel to a 7 position filter wheel for this very reason. Every swap potentially lets dust into the filter wheel and onto filters.
Photographic lens cleaning clothes are great for wiping filters and then a blast from a hurricane bulb is usually enough to keep them clean.
So if they are all clean then no usually rgb flats look the same and I have often used one for all 3 colour filters.
Luminance though probably should be its own and so should Ha O111 etc.
Luminance shows up dust motes the most.
Greg.
|