[ATM] F5 Achromat Design Help

[aneves@snowsoft.biz]

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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