On 21 Jun 2004 at 12:41, Jostein wrote: > Rob, > do I read you right to say that a lens doesn't need to be _razor_ sharp as > long as it's well corrected for chromatic aberrations?
Hi Jostein, Yes and no. The camera/best lens combo can manage no more than about 46lppm absolute resolution. Many lenses (such as the A50/2.8M) are good enough that you can virtually achieve maximum resolution from wide open to fully closed (and is virtually consistent across the entire image area). So the lens must have greater resolution than 46lppm to achieve the system maximum resolution. As you are likely aware the some lenses seem to be more prone to displaying chromatic aberrations when used in conjunction with the *ist D. Apparent sharpness is heavily undermined by CA as the Bayer de-matrix algorithms tend to enhance these errors. Cheers, Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications/ Pentax user since 1986, PDMLer since 1998
