RE: [ATM] F5 Achromat Design Help

["Thomas Janstrom" <tomjan@ozemail.com.au>]

Richard etal,

Still not that good, but getting better, I really think that if those
are the only glass types he has on hand then a slightly slower system
would be a much better option. How about we look at F6 and F7 just for
comparision purposes, after all who are we to say what he should do with
his glass?

A Strehl of 0.61ish isn't all that good, if we usually strive for 0.9ish
with our mirrors then something close would be nice for this type of
instrument too. I just don't think he'll get it without going to three
elements with one of them being a more exotic glass......

Clear skies, Thomas.
www.t_janstrom.com
www.norsewines.com.au 


-----Original Message-----
From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] On Behalf
Of Richard F.L.R. Snashall
Sent: Friday, 26 August 2005 4:13 PM
To: 'ATM'
Subject: Re: [ATM] F5 Achromat Design Help


However, for our daily dose of sacrilege:

Surf      Radius   Thickness    Glass
 STO    Infinity   -4.982462
   2      334.28        18.5    N-BK7
   3    -224.739       3.632
   4    -221.434           6       F2
   5    -1042.78    577.9452
   6   -208.8617      0.0044
 IMA      -154.1

The minimum focus here is at 522.499 nm, making the F-line mate,
longitudinally, with a wavelength of about 618 nm.  The central visual
Strehl is 0.6080 with a drop off of about 2.2 magnitudes at 10.4 mm from
the center. _______________________________________________
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