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Re: [ATM] Petzval Design



Richard F.L.R. Snashall wrote:
> In spite of being only about 1% longer than the corresponding
> N-K5/F2 design, it has about 37% less secondary color, measured
> as the distance from the F-C intersection to the e-line focus.
If it sounds too good to be true, it is.  Wrong graph -- should be 9%.
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