The proof should be in the results you get. I regularly shoot wide open with the A*300 f4 and the AF 1.7x on an *ist=D[s] and there is minimal visual degradation of the image. Admittedly the K20 has 50% higher liner resolution, but that shouldn't make that big a difference. I would expect that the DA* 300 AF 1.7x would do at least as well,
Thibouille wrote: > Mmm not sure MTF works. It should not work IMO since there's no > communication between lens and body except A-type informations. > > Your MTF program line probably fall back to standard program in this > case. A lenses do not provie any MTF informations. > > -- Vote for Cthulhu. Why settle for a lesser evil... -- Dr. Jerry Pournelle -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
