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Forum: Pentax K-5 & K-5 II
09-11-2013, 12:36 PM
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No such luck with wiggling and jiggling my Super-Wide II. It seemed to be more from the contact actually receding into the mount a bit.
Lightroom 4+ does a pretty good job of getting rid of this with a single checkbox you can leave on as a default, so no time spent. It is nice to see images actually become sharper than the lens actually took them. (Lateral CA is actually mostly corrected/fixed rather than masked.) I can't speak for the extreme (and unseen) edges you'd get on a full-frame camera, but for the lateral CA I do see from certain old lenses (even really bad) on the edges of the APS-C frame, it does a marvelous job of correction and improving resolution.
Ok, see pic below for bit of foil tape covering one contact. No problems whatsoever since -- before that it was a crapshoot what it would read. (Seemed to depend on the ambient temperature.)
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Forum: Pentax K-5 & K-5 II
09-11-2013, 10:51 AM
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No, just a little piece in the right place...gotta follow the chart. Let me check my lens...
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Forum: Pentax K-5 & K-5 II
09-11-2013, 09:55 AM
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The sigma lenses of this era are often fiddly this way -- piece of foil tape in the right place can fix it. My super-wide II used to the same thing -- would read f/2.8 on a cold day and f/4 if it warmed up (supposed to be f/2.8). Foil tape to keep the contact contacting, and it works fine.
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