Pentax Quality Control Strikes Again

Started Apr 23, 2015 | Discussions thread
OP Joseph Tainter Forum Pro • Posts: 10,996
Re: Pentax Quality Control Strikes Again

McSpin wrote:

Could you define "unbalanced weakness"? I have no idea what that means and I'd like to check my lenses.

Check the procedure here:

Edges and corners are always softer than the center, especially wide open (largest aperture). Check whether sides, top/bottom, corners have equal softness, or if one side or corner is weaker and the others.


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