Quote:
Originally Posted by gregbradley
The exception I can think of this Paul is David's 12.5 inch "Bunyip" Newt.
His NGC6744 and other images rival my CDK17 which is surprising but they do.
Greg.
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I have been thinking about this recently, I too will be looking at a galaxy rig later in the year and I wonder if the reason these newtonians do so well is they can get away with a small (relatively) obstruction. Punching some numbers into newt I can make a 8 inch f8 newt with a 9% obstruction (by area) with a 100% zone large enough for my kaf8300 to be 200mm outside the tube, plenty of room for an AO unit. Not sure if I would need a corrector at f8 though. I always wonder if this would be better than a rc8.
If I dont bother with the extra room for an AO unit, and put in 55mm for camera instead of the 200mm I can get away with a 50mm secondary which is a 6% by area obstruction.