From: "CSC" 
To: "Atm" 
Reply-To: "CSC" 


I don't know where the formula for the Dakin is.  Rutten & van venrooj
list a formula for a barlow.

using oslo or others?

What kind of primary?  what are you trying to do?  flatten the field?

Colin


-----Original Message-----
From: owner-atm{at}shore.net [mailto:owner-atm{at}shore.net]On Behalf Of
benoit schillings
Sent: Monday, July 28, 2003 6:49 PM To: atm{at}shore.net
Subject: ATM custom barlow...



I need to build or ray trace a 2 inch barlow lens to optimize a design I'm
working on... does anybody has data on the optical design of some of the
commercial barlow ? Would be a good starting point for me.

Also, I have a hard time finding any optical company with stock negative
achromats... Edmund has only 25 mm diameter lenses and Melles-Griot doesn't
seem to have much anything.


Anybody has pointers toward a good source of lenses with specs ?

Thank you

-- Benoit

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