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Re: [ATM] Alternative Petzval Design

Richard F.L.R. Snashall wrote:

>
>Not necessarily... I wonder if there's an extra degree of freedom around
>here:
>
An all ECO version:

288 mm f/7.5 ECO Petzval
VS: 0.5443 at 0.0432 mm
Min: 545.077

Surf     Radius   Thickness    Glass    Diameter
 OBJ   Infinity    Infinity                    0
 STO   Infinity   -8.829648                  288
   2    1178.64        31.2  N-BK7           300
   3   -1178.64       5.004                  300
   4   -1178.64        21.3   N-F2           300
   5   -25598.4      1707.6                  300
   6    533.844        18.6  N-BK7         139.2
   7   -533.844        11.1 N-BAK4         139.2
   8    880.608    698.6448                139.2
   9   -2198.76      0.0432               42.168
 IMA   -2198.76                           42.168

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