On Sun, 29 Feb 2004, Joseph Tainter wrote: > "Joseph Tainter a �crit :" > > "Alex, help with a little test, would you? Set the *ist D to mtf (custom > function 1), then test it outside in program mode on a day with good > light. What f-stops do you get at different focal lengths? I got the > following, which seemed odd: > > "16-28 mm. f4.0 > > "35 mm. f4.5 > > "45 mm. f5.6" > > "It is normal, MTF mode does not propose the fastest aperture, but that > where optical quality remains good. Chage custom fonction or use green > program to avoid f/4 constant. > "Michel"
My lens produces the same results. It is interesting that Pentax thinks that this lens has the best results at f4. It would be interesting to see how it tested by an independent lab (photodo or the like). alex
