10" Schupmann at RTMC
PFAFF2@delphi.com
Mon, 03 Apr 1995 01:29:25 -0500 (EST)
Jerry Logan is finishing his 10.25" f10 Schupmann medial refractor
and will bring it to RTMC. He folded the design. The tube asm. is
only 4ft 2in long.
FYI:
A Schupmann medial refractor has a single element objective of
crown glass and an internal corrector made from the same melt of glass.
It is unostructed and has no color. The first design by Ludwig Schupmann
was published in 1899. Only a few have been built over the years, the
largest I think is a 15.1" in 1911.
Jerry built a 7" f10 in 1990 (superb you just turn a knob and the color is
gone) So many telescopes so little time :-)
Bob Pfaff