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Old 28-12-2012, 12:52 PM
clive milne
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Jaw dropping optics from TEC

http://www.baader-planetarium.de/tec...300mm_7deg.pdf

A modified 12" houghton cassegrain that can cover a full 16803 chip with pixel limited images.....

at a focal ratio of;

drum roll...


f1.44
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Old 28-12-2012, 01:23 PM
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mithrandir (Andrew)
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Quote:
Originally Posted by clive milne View Post
http://www.baader-planetarium.de/tec...300mm_7deg.pdf

A modified 12" houghton cassegrain that can cover a full 16803 chip with pixel limited images.....

at a focal ratio of;

drum roll...


f1.44
Got a spare $US45-60K? CloudyNights has a post with that price range.
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Old 28-12-2012, 07:23 PM
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Shiraz (Ray)
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thanks for posting Clive - that is a staggering spec.

the light goes through 3 refracting elements before it hits the primary mirror - takes the SCT idea to a whole different place. and its all done with spherical optics. amazing
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Old 28-12-2012, 08:11 PM
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multiweb (Marc)
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The hyperstar will give you F/1.8 at a fraction of the price.
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Old 28-12-2012, 08:17 PM
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Wow, what an awesome piece of equipment, that would look good at my place.

Leon
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Old 28-12-2012, 10:38 PM
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MortonH
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Originally Posted by mithrandir View Post
Got a spare $US45-60K? CloudyNights has a post with that price range.
At that price I'll get two and bino them.

A very nice piece of kit for someone.
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Old 28-12-2012, 11:10 PM
clive milne
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Originally Posted by multiweb View Post
The hyperstar will give you F/1.8 at a fraction of the price.
Sure, but it is still a full f stop slower and only images 15% of the area of sky (approximately).

Interestingly, the places where I have seen the hyperstar specs published, they don't state performance in terms of theoretical ray trace results (which aren't always meaningful) or real world encircled energy.

Anyway, aside from all that the design is really impressive.
Achieving 7 degrees of anastigmatic flat field in a non-symetrical compact cassegrain using an aluminised spot on a correcting element as the secondary mirror and keeping it all spherical... Now that is genius.

Last edited by clive milne; 29-12-2012 at 11:57 AM.
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Old 01-01-2013, 05:04 AM
Poita (Peter)
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So, when is GSO bringing one out?
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