There is a lot of wisdom that says this lense suffers from distortion.
Having said that, I believe that the distortion present is only going to be
objectionable when you photograph graph paper or a scene that has horizontal
and vertical lines that are prominent, off-center, and expected to be
presented in the image undistorted.
If you plan to use the lens to exaggerate perspective, photograph in tight
locations where you cannot get back far enough to take in a scene, control
background, etc., you will love it. The SMC version might yield better
contrast and better flare control, but the ST version is still a very worthy
lens.
ppro
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