Only 3 half-hour subs but I am extremely pleased with the result!!  No dither so full of hot pixels, but good quality stars corner to corner on an APS sized chip – the Sky 90 CAN deliver the goods, but only IF you have almost spot-on collimation.  If the collimation is even a tad out then you will get coma in the corners of an APS size chip (e.g. M25C or M26C).


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