On 20 Jun 2004 at 10:50, Joseph Tainter wrote: > Interesting. Pentax thinks that the DA 16-45 gives its best mtf > performance wide open (f4.0) between 16 and 24 mm., and f4.5 thereafter. > So is the DA 16-45 a diffraction limited lens? And in terms of everyday > shooting, what does that mean? (I've used it at f16 when I wanted DOF, > and that the results were stunning.)
The sensor in the *ist D is more sensitive to colour convergence errors than absolute sharpness, the sensor is really quite low resolution relative to film. Plus MTF is generally not a broad-band measure, it's generally at a specific colour, as such it's very difficult to relate MTF to absolute sharpness performance particularly relative to Bayer sensor based digital cameras. 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
