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Lew Chilton
Pooh-Bah
Reged: 10/20/05
Posts: 1019
Loc: SoCal
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Quote:
Do you have an experience with the Cave DK Cassegrains? Are they up to par with the newtonians?
Cave relied on Three-B Optical Co. in Mars, Pennsylvania for much of its classical cassegrainian optics, and I presume for its Dall-Kirkhams, as well. Three-B ads appear in S&T in the 1950s - 1960s, if memory serves.
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I don't get no respect, but my scopes do! 
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1961 Swift 60mm model 839 (2); 2003 TV-102/GM-8; 1959 8" f/6 Treckerscope; 1959 8" f/7.4 Murray Scope; 1959 Fecker Celestar-4; 1978 4" Edmund Astroscan; c. 1986 4-inch Celestron-Vixen SP-C102; c. 1950 20X60 Saturn spotting scope; 1963 7X50 Nippon Kogaku binoculars; Unitron #114 alt-az mount (Swifty-tron)
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clintwhitman
Caveman
Reged: 01/01/07
Posts: 2427
Loc: ValVerde CA(SoEasyaCavemanCanD...
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Paul I had the 12.5 on a 1.5 shafter and sold it. The 14" tube is a monster!! Kudos for getting it in the car!! The 10" F8 is just enough to deal with and the 1.5 mount just handles it well enough. If you really want a 12 heres the mount you need!!  The Byers 813 could hold a 12.5 and the 10" for a guider.... LOL
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Clint&Debbie Whitman (aveman
1960s 6"F15 Jaegers-Unipons by John Pons on a Byers 812, 1947 4" F15 TINSLEY, 1965 10" F8 CAVE, 1950 5CM & 6.5CM Nippon Kogakus (the twins), 1960s UNITRONS a 152 restored a 160 numbered green lens original mint a 114 original 50s mint, 1950s UNITRON M100 100mm F15 OTA, WO 80mm Florite, ASTROPHYSICS 155 EDFS on LOSMANDY G11, a bunch of Tascos,Sears Mayflowers The list goes on Add infinitum.
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Kevin Brose
member
Reged: 07/03/07
Posts: 22
Loc: Colorado
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Quote:
Do you have an experience with the Cave DK Cassegrains? Are they up to par with the newtonians?
I used to own a 10" Cave D-K Cassegrain that was made in 1978 or 1979.
To put it bluntly, the optics were a disaster.
I had the secondary tested on a Zygo and it was anything but a sphere. The ellipsoidal primary was grossly over corrected. Fortunately I knew a local optician who made mirrors for a high profile optics company. He was able to fix the Cave optics, after which the telescope became an excellent performer.
Perhaps the Cave D-K's of old had good optics, but for anything built in the late '70's - caveat emptor.
- Kevin
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skyward_eyes
Carpal Tunnel
Reged: 12/12/06
Posts: 2100
Loc: Arizona
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Good to know, right now I think I am going to stick with my loan 6" f/4 RFT. Maybe I will track down an 8" RFT sometime. I am more focused on the design of my future 24" f/4.3 Truss dob which the 6" RFT will be piggy backed on as a finder.
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www.skywardeyes.webs.com
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