On 11 Feb 2006 at 11:48, Mark Erickson wrote: > Check out the test results from Rob Studdert's comparison of a few top-notch > 35mm Pentax lenses against similar-focal-length 645 lenses: > > http://home.swiftdsl.com.au/~distudio/mfv35lenstest/ > > The 35mm lenses look better, but not by all that much....
I haven't done any semi-scientific testing of my Mamiya 7 lenses as compared to my best 35mm gear but after staring at many chromes I'd guess that most would measure up a lot better than their Pentax equivalents in 35mm or MF so I don't think it's wise to generalize. However I don't think it matters too much in the context of the 645 lenses being suitable for use on an MF digital body either. The pixel pitch of the MF DSLR sensor will be somewhat larger than that of the current K-mount DSLRs (Sony ICX413AQ), ie 9m vs 7.8m (that is if they stick with the previously announced 18.6MP KAF-18000CE image sensor from Kodak). Assuming that they apply to this an anti-aliasing filter with similar (and desirable) cut-off frequency ratio as they have employed in the K-mount bodies this would translate to a maximum practical resolution of about 38.6lp/mm, I'm sure most of the 645 lenses can deliver better than that through out their aperture range . 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
