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| Re: Scopes
Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To Posted by daViper on July 10, 1999 22:01:31 UTC |
I thank you for your reply. I have just started to do some serious looking and your reference is one I'll be sure to check out. My research so far is showing that the apochromatic optics with ED has come a long way in correcting the chromatic abberations of older technology and of course spherical abberation is a function of lens curvature accuracy across the entire surface i.e. quality. I'm beginning to think a 6" diameter may be a bit optimistic since the really high quality ones are going for 10-30k not the 4-6k I'd be prepared to spend. Looks like 4"/1000mm is about the norm in this range for a top of the line instrument. A good mount will of course be required but a full blown observatory seems overkill for a scope this size. I am aware of why the price and quality of refractors is an exponential problem relative to size, not to mention size itself and weight. The old refractor at Denver U. if I recall is 12 or 14 inches but 25 or so feet long and weighs a couple of tons. It is a MARVELOUS scope tho. Been many years since I had the pleasure of using it during adult ed classes back in the 70's. I'm really getting into planetary astrophotography and want the best scope for THAT purpose. The Celestron has been a big disappointment, as well as another friend's Meade 10" Cassegrain. I'll look into the larger newtonians more since my location is ideal for a permanent installation. I'm not too far from some of the best in the world, and that's why they came here. Although I wont have their altitude, the light pollution is virtually non-existant where I am and the air quality is as good as you'll find. Maybe a custom built 24" Newt or something comparable will be the answer if set up properly since a good solid permanent mount and tracking abilities are the real goal here. Again, Thank you for your response. |
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