I started a thread on Cloudy Nights for a group build of an 8 inch F/7 Chief. I have had a custom lens make to mate with a Newport Optics COTS lens so that all the optics for this design can be bought and assembled into an unobstructed telescope. The 8 inch F/7 is a standard primary listed on Discovery’s web site. The concave corrector I am having made, the convex corrector is a Newport optics KPX205 lens and is listed for $75. Then it uses a 2 inch secondary mirror and a standard 2.14 inch mirror will work fine from a number of suppliers. Below is the optical prescription in Zemax for the 90 degree layout although other layout are possible
Here is a closeup of the correctors with coordinates taken from the Zemax layout.
Here is a link to CAD files and Zemax files.
Optical Ed's 
The CAD file links are missing the server name, so consequently don’t work… Is there another way to obtain these files? Thanks!
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Send me an email and I can email you. What files do you need?
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With Ed’s consent, I have placed all the files (mentioned above) on Thingiverse and are now available for download. Here’s a link:
https://www.thingiverse.com/thing:4882820
I am not a 3D artist/engineer/designer, but will attempt to add a design file for the corrector lens cell, which could then be printed. When finished it will also be available from Thingiverse at the above stated link.
Vern
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