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Chip205
newbie
Reged: 11/02/09
Posts: 1
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Is anyone familiar with Kutter's catadioptric 6-inch f/20 schief design? I have most of the specs, but the ROC of both the primary and secondary (which may be different) aren't specified. I'm also a little confused about the system's focal length compared to the primary's: the former is listed as 3000mm, but no magnification factor is given for the secondary.
Any help here would be appreciated.
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Mark Harry
Post Laureate
Reged: 09/05/05
Posts: 3121
Loc: Northeast
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Thought Kutter's verion for a 6" was about F/30-ish...? Just supposing if that's so, I was diddling with one of these designs; and the ROC for both pieces was around 100"~ (2500mm). I'd have to check my tooling to be sure.
Mark
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So many projects, so little time!
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DAVIDG
Carpal Tunnel
Reged: 12/02/04
Posts: 1985
Loc: Hockessin, De
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Here is a screen shot from an OSLO file for the Kutter 6 f/20.
The primary has a radius of 144" and the secondary 152". The design is given in Telescope Making #10. We have a Yahoo Group for people interested in Schiefs http://tech.groups.yahoo.com/group/schiefbuilders/
I've built a couple of Schiefs, excellent telescopes.
- Dave
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Homemade 'scopes 8"f/7,6" f/5", 6"f/4, 4.25" Schief. 60mm Coronagraph,60mm H-alpha system, 4.25" White-light Solar Newtonian,solar spectroscope, 4.5" f/16 Schupmann Medial refractor, 14 Stellafane awards 7 in optics
Engineering = Taking what you have and making what you need.
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DAVIDG
Carpal Tunnel
Reged: 12/02/04
Posts: 1985
Loc: Hockessin, De
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Here is a spot diagram for the 6" f/20 Kutter Schief for 0.5 degree field of view which is the size of the full Moon. As you can see it is very good.
- Dave
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Homemade 'scopes 8"f/7,6" f/5", 6"f/4, 4.25" Schief. 60mm Coronagraph,60mm H-alpha system, 4.25" White-light Solar Newtonian,solar spectroscope, 4.5" f/16 Schupmann Medial refractor, 14 Stellafane awards 7 in optics
Engineering = Taking what you have and making what you need.
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