Quote:
Originally Posted by alistairsam
Wow, look at the size of those stars.
Did you just add them in for some seasoning? They're next to non-existent.
Amazing.
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Theres been another long thread about ray trace spot sizes of various designs which evolved ( again ) to whether optical quality in Deep Sky imaging is obvious in the final image . An instrument such as this ( assuming perfect optics ) with a 50% central obstruction will put about 50% of its available light into the Airy Disc and the rest spread out into surrounding rings .
Matched with the right pixel size in the camera , we can assume then that this kind of result ( equivalent to 1/2 wave RMS of spherical aberration in an an unobstructed telescope ) , is some kind of bench mark for quality in deep sky imaging equipment .