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zebra:(1) PTB: 3rd order Petzval blur Hkcr+BQ 只有場曲時,在成像面形成圓斑之尺寸,應該是半徑。 ?x*Ve2+] 但場曲有正負,此值也可以是正或負。(2) PTZ: Petzval surface curvature $<y10DfO .......(2012-05-12 00:45)嬀/color] $!(J4v=X
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