Quote:
Originally Posted by 2stroke
Haven't had a play with it myself yet but need to, did you try a smaller secondary?
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A smaller secondary for an astrograph would be a bad idea, I think that he is better off increasing the size of the secondary to "future proof" himself for when he hooks this beasty to a 11002 chip.
Also the 100% rays are all you need to worry about, vignetting of the 75% rays dont mean anything if you are fully illuminating the chip. If you are planning on constructing a tube for this a 13 inch diameter for a 12 inch scope is a little ambitious with the cell and room to tilt the mirror for collimation.