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Forum: Pentax K-5 & K-5 II
09-11-2013, 11:50 AM
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A couple of notes.
What causes the reported "fiddly" behaviour is the fact that the contact pins on some sigma A lenses are drilled in a pair of straight lines of 3 pins, lying tangent on the true circle center of the Pentax mount. This causes minor mis allignment of some pins and lost contact. Rock the lens back and forth in the locked position and see if you can get F2.8
Second, the mini wide II with KA mount suffers very badly from lateral CA. Unless you plan to spend time in PP with every image and correction the edge resolution is pittifull at best
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