> When I set the program line to MTF my camera always
 > wants to use wide
 > open aperture on the 16-45 which isn't what MTF
 > should do.

Unless it is.  Other FA lenses on MTF program have
given me f/5.6 through much of the range (on my Z-1p;
haven't checked on the D or k10D), IIRC.  Maybe f/4
=is= the best aperture.

Rick

-----

MTF program line will give F4 from 16-28 mm., and F4.5 above that.

At least on my DA 16-45, F4-F4.5 are demonstrably not the best 
apertures. They are good and useable, but not the best.

This problem has made me wonder if Pentax didn't implement MTF properly 
in the DA 16-45's chip, or in the DSLRs.

Joe

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