Amateur Telescope Making
The 12.5 inch - Birch Mesa Observatory Astrograph
Uploaded 12/5/17
 Finally, the
            12.5" astrograph was moved to Payson in 1990. The observatory
            was a roll off roof, and we rebuilt the tube as a solid wood
            unit to minimize flexure for imaging. It worked great, but took
            too long to equalize thermally. The mount had a hard time tracking
            precisely with such a heavy tube at this point, and the tube
            was due for a rebuild soon.
 

            

            
 

            
Much wood working went into this tube! It was
really solid and I could mount all sorts of other
instruments on its back.

The 12.5" f/5 Astrograph
Rev 2 - Photographic

            
 


            
Click
            for Full 1290 x 960 size



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