Nope,if there would be that much CA of **either** type, right in the center of ANY lens, the amount you would see in the edges or corners in same image would be absolutely horrendous and no commercial lenses are/were ever that bad. jco
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Digital Image Studio Sent: Saturday, April 14, 2007 9:02 AM To: Pentax-Discuss Mail List Subject: Re: Full frame lenses and the K10D, CA anyone? On 14/04/07, J. C. O'Connell <[EMAIL PROTECTED]> wrote: > then its definately NOT CA. > CA presents itself as a difference > in magnification of the R/G/B > images but when you look at the > center this difference is nearly > zero even with HUGE CA in a lens. > What that is, I dont know, but > it cant be CA because if it was, > there would be an impossibly large magnitude of > CA in the corners. True if the problem was transverse CA but the problem as described is most likely due to axial CA, see: http://www.vanwalree.com/optics/chromatic.html -- Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://home.swiftdsl.com.au/~distudio//publications/ Pentax user since 1986, PDMLer since 1998 -- PDML Pentax-Discuss Mail List [EMAIL PROTECTED] http://pdml.net/mailman/listinfo/pdml_pdml.net -- PDML Pentax-Discuss Mail List [EMAIL PROTECTED] http://pdml.net/mailman/listinfo/pdml_pdml.net
