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zebra:(1) PTB: 3rd order Petzval blur m&&m,6``P 只有場曲時,在成像面形成圓斑之尺寸,應該是半徑。 @lr ztM 但場曲有正負,此值也可以是正或負。(2) PTZ: Petzval surface curvature R-d:j^:f ....... (2012-05-12 00:45) ;iL#7NG-R
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