Dale Keller's 10 inch F 5.6
Dale Keller built this 10 inch F5.6 newtonian reflector using Coulter optics. The
full-thickness mirror was produced in 1980, when Coulter was known for their high
quality. The tube is sonotube with shallow foam weather-strip baffles. The primary
mirror is mounted in a homemade aluminum 9 point flotation cell. The 1.83 inch
diagonal mirror is mounted in a Kenneth Novak holder with a
homemade brass curved-vane spider.
This size diagonal was selected to give an 18% (by diameter) obstruction of the primary
mirror. This produces a high contrast image at the expense of the 100% illuminated
field of view. The focuser is a 2 inch low profile helical type. The finders are an
8x50 straight-through and a telrad. Three handles are mounted around the tube near
the focuser for convenience in pointing the scope.
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