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Oh I misunderstood Peter. I thought the blue issue was with the 180.
And you are getting no problems in the other channels? Sorry you probably have mentioned all this in previous posts on this thread. You refocus after each filter change? In my experience Baaders are nowhere near parfocal despite their claim. Astrodon's are.
There is a difference in flourite and colour correction and fluorite is chosen because of that. But I would have thought it was more to be able to get the same colour correction with a faster F ratio rather than
better colour correction at the same F ratio over ED glass. There is better scatter which could account for better blue performance (but as you see in my samples not really only if the star is not too bright).
Good luck with your experiments. I also think it may be useful to post on the SX Yahoo Group to see what others are finding. Or use your 8300 camera for colour and the Trius for luminance.
Greg.
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