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Yeah Greg - this was a yahoo i've got my AP image when Orion was getting low - i agree more data. I only seem to get the curtain effect in Ha but - For some reason I only get a flat sheet of nebulosity with Astrodon Lum filter. I am still struggling with this filter as my star 1/2FDs are usually of the order of 60% larger than those I get in RGB - even with reduced exposure substantially - I still cant work it out - that is why I am imaging Ha blended Lums. I am hoping to catch Don GOldmans ear at AIC to query him on it - it is obviously something I am doing wrong. Hint taken re the sponge mate - will try it.
I am not sure 100% what you are saying here. 1/2FDs? what does that stand for 1/2 full well depth of the CCD?
The 8300 chip has small well depth of about 25,000 electrons. This is a low number. For example the 16803 chip has about 100,000. What this means as far as practical application is bright stars spill over and become bloated quite easily.
Is your luminance filter UV/IR coated or is it a clear filter (with no UV/IR block). A clear filter will bloat stars more than a luminance filter (UV/IR coated) but it lets more light through and gets a bit more of the really faint stuff. But that is the cost.
Are you focusing on the luminance filter sharply? It sounds odd the stars are 60% larger than in the colour filters. Usually blue has the largest stars sizes.
Greg.
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