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zebra:(1) PTB: 3rd order Petzval blur [7HBn 只有場曲時,在成像面形成圓斑之尺寸,應該是半徑。 _yR_u+5 但場曲有正負,此值也可以是正或負。(2) PTZ: Petzval surface curvature +WR?<*_ .......(2012-05-12 00:45)嬀/color] 6__!M
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