[ATM] Refractor perscription

[rflrs at rcn.com (Richard F.L.R. Snashall)]

Thomas wrote:

 > No I'm not optimising it for anything other than visual work, the glass
 > thickness are just what I got in the box yesterday. Personally I 
think the
 > flint is very thick, but I don't know what the glass was originally 
ordered
 > for...
 >
 > Anyway could you let me know what the aberations look like, and most
 > importantly is the design workable;)
 >

I've added a couple of short-term files to my site:

	http://users.rcn.com/rflrs/tj01-01x.len
	http://users.rcn.com/rflrs/tj01-02x.len

I'm assuming that the first looks a lot like your own.  The second is
the design that came out of the GSUM calculator.  I've added dummy
surfaces after the last real glass surface so that the lens drawing
could be restricted to showing just the lenses; this gives me a better
mental picture of them... yup, that second lens is a tad thick;-)

In the TW window, if you hit the "Abr" button, it lists the aberrations
in that window.  The GSUM calculator is designed to reduce the
spherical aberration and coma.  The first two Seidel aberrations, SA3
and CMA3 are the third order spherical aberration and coma terms.

 > Thanks.
 >
 > Clear Skies,
 > Thomas Janstrom
 > http://www.tjanstrom.com
 > http://www.norsewines.com.au



-- 
------

Rick S.

http://users.rcn.com/rflrs