Quote:
Originally Posted by DavidTrap
You have to grind and figure only one optical surface for a reflecting telescope. You have to figure both sides of any lens you make for a refractor - lot more work.
DT
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Very true and for a crown/flint doublet that equates to 4 surfaces with different radii of curvature. A good reference is 'Telescope Optics, Evaluation and Design by Harrie Rutten and Martin van Venrooij, published by Willmann Bell. In fact
http://www.willbell.com/ has an entire section devoted to telescope making and optics. Some books have optional software for optical design available too. If your order direct from the publisher get the software at the same time otherwise the double freight will be excessive. BINTEL have a wide range of Willmann Bell books on their shelves too.