RE: [ATM] F5 Achromat Design Help

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

Alfredo,

You didn't mention what/which glass types you have.

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 aneves@snowsoft.biz
Sent: Tuesday, 23 August 2005 11:10 PM
To: atm@atmlist.net
Subject: [ATM] F5 Achromat Design Help


Hi,

Does any of the refractor gurus out there have a good design for a F5 or
F6 achromat (120mm diameter). I used richard's GSum program to design
one and got a design were the spot diagram is about three times the airy
disk (I asume tjhis is great at F5)! But since I do not have the
experience of evaluating lens designs I would rather get a design from
someone more experienced in the matter. My second question is how thin
can the negative lens center thickness be for a 120mm achromat. The
reason being that the flint disk I have is only 14mm thick! I am worried
that 6mm might be too thin and make the lens warp while grinding and
polishing.

Thanks,

Alfredo

 
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