Wolfgang Busch,
Who made the First Practical Oil-Immersion
Triplet Apochromat for Amateur Astronomy in 1974

HI Richard:

I believe "oil immersion objectives" are a feature of microscopes, not
telescopes, right?

Peace,
Rod Mollise
Author of _Choosing and Using a Schmidt Cassegrain Telescope_
Like SCTs and MCTs?
Check-out sct-user, the mailing list for CAT fanciers!
Goto http://members.aol.com/RMOLLISE/index.html