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Well I'm no expert when it comes to star testing, but I do know what an airy disk should look like. I have trouble with judging intra & extra focal images, because to me they always look slightly different in the same way regardless of the scope I look through. But the star image on the TSA certainly holds tightly symmetric all the way into focus, as does my 10" newt.
In terms of the false colour I mention, I was using a 6mm delos with 2.5x powermate for 375x & it seemed mainly violet. Like i said, I think the colour was only as the image defocussed with the seeing. It was not visible at 150x. Of course what will really matter is real observing :-). I have'nt been able to look at the moon yet, so I am curious to study the moon limb at high power.
The only colour I've ever noticed with my eyepieces when used in my 10" newt. Is a yellow tinge along the moon limb, mainly with my older T1 & T2 naglers.
I understand that the TOA design has better colour correction than the TSA.. Not sure how/whether that would translate into any real world differences in terms of visual use though?
I know I'm REALLY fussy.. But thats why I got a Tak! Looking forward to the moon....
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