Quote:
Originally Posted by RobF
Nice Greg, especially near city lights. Must be a wonderful rig to work with. My only thought would be a little more short exposure data on the brighter regions/stars might make those a little less harsh. It is certainly interesting to see so much close detail when people are normally shooting this ultrawide.
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Thanks Rob. In hindsight I agree it could have benefitted from some short exposures blended in to the "core". Those central stars are quite bright and that's after several steps to tame them.
The CDK17 is a very nice scope. But it really needs careful flats otherwise it can be very very difficult. Vignetting is one of the compromises in the optical formula they have chosen. So I find it vignette quite badly on the 16803 chip and that becomes aggravated by a bit of hot central spot. If there is any light pollution like to my east, it makes image processing very difficult, hard to get colour balance, and generally requires a lot of careful gradient handling processing. This one was way to the west where its darker for me and not much light pollution. I am going to make a little baffle for the mirror where it meets the central tube to reduce this hot spot after talking to Joe Hedrick from Planewave at AAIC.
Greg.
Greg.