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zebra:(1) PTB: 3rd order Petzval blur {KDgK 只有場曲時,在成像面形成圓斑之尺寸,應該是半徑。 V-_/(xt* 但場曲有正負,此值也可以是正或負。(2) PTZ: Petzval surface curvature v'@b. R, ....... (2012-05-12 00:45) g(<T u^F
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