Pentax Quality Control Strikes Again

Started Apr 23, 2015 | Discussions thread
soheil Veteran Member • Posts: 3,024
Re: Pentax Quality Control Strikes Again

Joseph Tainter wrote:

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.



I'm sure you know this already butI'd like to remind you to do your test both in landscape and portrait modes and see if you get the same result at the same corner. This way you'll be sure if your setup is accurate or not.

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