Hi everyone,
I own a K-3II with few lenses: 70 Ltd, DA* 300, 12-24mm and Sigma 17-70 and have no problem with them.
I just purchased a 20-40mm lens 3 days ago and encounter a very strange and anoying issue... at 20mm the edges of the frame are ok, but at 40mm they're very very soft at every aperture. When I say edge, I mean everthing outside the 1/3 center of the frame...
Here is the strange thing: on the 500 pics I took with the lens... 2 are perfectly starp across frame, but I don't know why and I cannot reproduce this... The problem is more visible outdoors.
This morning I tried the lens with my old K10D, and the border seems to be far more sharp than with my K-3II... how is this possible???
It cannot be back/front focus as focus has been done in LV/tripod/timer... on most of my pics. So I really don't know what is the problem. Can my K-3II be faulty? even if it work perfectly fine with all my others lenses?
Here are samples pics:
The two firsts are taken with K-3 (focus 1/3 into the frame).
This one is perfectly sharp, I don't know how I do!?
This one is from my K10D: it is sharp edge to edge
Any idea? Should I return the lens?
Last edited by superdave; 01-12-2017 at 01:26 AM.