Homemade 'scopes 8"f/7,6" f/5", 6"f/4, 4.25" Schiefspiegler,60mm Coronagraph,60mm H-alpha system, 4.25" White-light Solar Newtonian,solar spectroscope, 4" f/12, 4.5" f/16 & 6" f/12 Schupmann Medial refractors, 4" Celestar, 19 Stellafane awards 9 in optics Engineering = Taking what you have and making what you need.
Quote:Also I suspect that the corrector needs more orders than olso's sliders can give.
Quote:Must admit I'm impressed by GENII now I know I can edit the operands but can't find a list of what they influence. Some are obvious. Also would like to be able to get rid of genii operands and use the direct normal operands without exiting oslo and starting it up again. These only seem to work axially though. I can't see any way of say pointing them at the 70% zone of the image. Is there one?Maybe some on can help?
Quote:This is as near as I can get to what Baker seems to have intended - coma a slight problem at a semi angle of 3 degrees covering an 8in dia circle. Going on the MTF curve it looks like it even nearly meets Rayliegh's 1/4 wave limit at 3 degrees. Astigmatism seems to be the main problem there.20in mirror and 17in aperture.
Ed Jones ........... The best data is an interferogram, the best analysis is from an honest optician.
Quote:the vacpan info that is available to me is based round a corrector curve of Z=Ar^2+Br^4 where Z seems to be the actual numeric deformation of the glass
Quote:I suspect that it wouldn't be as good at F3 as the Baker
Quote:My guess is that he's trying to make use of the 220mm f/3 paraboloid he already has. I agree - dialytes like Honders, Busacks, etc. systems blow away almost anything else for field and spectral coverage in ATM-sized apertures. But John's wanting to work with what he has in hand.
Quote:For a laugh I just let 3 of oslo's optimise routines try and sort SA out on something else from a flat surface. The results were awful. Hardly surprising really but if I look more closely I may find that they can be forced to work to closer limits on SA. Doing the correction manually as well showed just how messed up colour correction can get via oslo's constants. I've asked the same question about the asphere constants several times and no answer. Interesting as it seems to be an insurmountable problem using edu.
Quote:I am beginning to think you are a rather offensive person MKV. Perhaps you just can't answer the question if that is the case there really isn't any need to be rude. On the other hand on the web Mike for instance and me in other areas are as helpful as we can be who ever it is who asks for help. One thing for sure you haven't even read the part that you quoted.