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Excellent. With these Keller correctors, are they optomised for an exact F ratio, or do they work well over a range of F ratios?
Id also love to see how a modded DSLR works on a scope like yours, perhaps we can go the whole hog and borrow Houghys cooled one when it comes back, it produces next to zero noise at a sensor temp of 0 degrees c. Id tip that, say with an hours worth of imaging and a UHCS filter, stunningly faint emission nebulae could be imaged.
Your fast scope will be especially useful for comet imaging as well. I have a 6 inch "poor mans" version, a Meade Cometracker Schmidt Newt. Even with the corrector plate it has coma, but the Baader multipurpose coma corrector I have removes much of it.
Collimating is a challenge, Ive tried it by star testing, if I collimate to get round diffraction rings with, say a 4.8mm Nagler, when I use a barlow the rings are off centre, but if I re collimate they are off without a Barlow. I guess youve found out how touchy collimation is with your fast scope too. Yours has special tools for collimation?
Thanks
Scott
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