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Good one there Alex. You are accumulating some nice gear there.
I doubt the RBI flush is that important despite the remarks of some.
I haven't had any problem or bad artifact from my FLI 8300 at all. Its super clean. Then again you need Maxim DL to run the RBI flush.
What you need here is some deconvolution work.
I'd recommend this:
1. On the luminance open in CCDStack and click on deconvolution.
2. Set iterations to 40 and use positive constraint (not sure about max entropy when its used, I am sure there is a criteria about when its best).
3. Click on a few stars near the centre of the image until you find one that is lowest FWHM. Now I could have this wrong perhaps you need one with the worst FWHM as deconvolution means deblurring. Check your theory on this point but that is what I have been doing. A few stars will be much lower FWHM than the others. Usually just off centre.
4. Do the deconvolution. It is a slow process but at least the 8300 files aren't as big as the 16803 files.
5. Save it.
6. Now do it again and repeat until you get maximum benefit. That may be 3 times though. If you get oversharpened stars go back to one of the earlier versions - hence the step of saving each time through.
Do the same on each of RGB.
Now do your final alignment and colour combine. You'll have way sharper stars and less bloat and more detail on bright objects.
I think this sort of routine is done by guys like Johannes Schedler whose images always have tiny pinprick stars. No scope does stars like that that I have seen. So its tight stars in the imaging from excellent careful focus, good seeing of course and then deconvolution. Add to that well engineered filters that don't bloat and you should achieve some nice tight stars.
I would expect the stars to be tighter with a Lomo 80/600mm triplet though as it is very widefield and the stars should look like sand as in an FSQ106.
I had a Lomo 80/480 triplet WO and apart from focuser not being square causing bad seagulls at first until shimmed the lens itself was pretty awesome.
Did you get tight focus with an electronic focuser?
Greg.
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