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  #21  
Old 02-01-2007, 01:20 PM
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h0ughy (David)
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Quote:
Originally Posted by Starkler View Post
Houghy, you even posted in this thread containing the pictures
not my piccys and the links no loinger work for the german site
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  #22  
Old 02-01-2007, 08:02 PM
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Quote:
Originally Posted by Starkler View Post
I suggest that the rocker box is going to be way too flimsy, requiring bracing or stiffening ribs to be fitted. Also from the picture the spider appears to be too skinny, which will cause the secondary to move with changes in altitude.

I hope thats not the case, or you would be forever chasing your tail to keep it collimated.
If that is the case houghy I'll have a look at it and I could put some nice concealed stiffeners in the rocker box if you want.
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  #23  
Old 02-01-2007, 08:55 PM
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h0ughy (David)
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Quote:
Originally Posted by Orion View Post
If that is the case houghy I'll have a look at it and I could put some nice concealed stiffeners in the rocker box if you want.

ah the maestro of photon collection devices speaks, I listens, and takes him up on it!!!
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  #24  
Old 03-01-2007, 10:04 AM
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Quote:
Originally Posted by h0ughy View Post
what will be needed to fix up one of these units, I know that certain members have doctored their 12-8 versions, would the same be needed for this one?
The massive 45mm thick B270 glass blank on the 16" ( same expansion co-efficient as plate glass ) can't be upgraded, so its performance on any particular night at high power will be at the mercy to some extent of the prevailing weather conditions, but the image should look satisfactory at low power on most nights assuming the 'thermally stable' figure is at least the 1/2 wave PV wave-front minimum optical spec that Guan Sheng quote on their website ( "1/16 wave PV RMS surface" ) and allowing they are talking simple spherical aberration.
http://www.gs-telescope.com/content.asp?id=95

Mark

Last edited by Satchmo; 03-01-2007 at 11:31 AM.
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  #25  
Old 03-01-2007, 11:38 AM
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h0ughy (David)
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thanks for that info Mark
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