Re: [ATM] Achromatic Doublet Design Help

["Bob May" <bobmay@nethere.com>]

I don't think that you're doing a F15 as the focal plane is 1200mm after the
50mm lens diameter.  That makes it more of a F24 design!
I do believe that it is a diameter there rather than a radius.
The lens curves tend to be a bit shallow with a first curve of 1000mm and
the flint seems a bit odd with a near equal curvature on the two surfaces.
That lens is usually bent so that the back surface is near flat.
GSUM shows a quick starting point where the curves are
R1 909.6mm  T1 10.67mm
R2 -574.6mm  T2 .002mm
R3 -531mm    T3 8.66mm
R4 -2245.8mm
and this looks a lot more typical of what the elements should look like.
Bob May
http://nav.to/bobmay
bobmay@nethere.com
NEW! http://bobmay.astronomy.net


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