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Forum: Pentax K-3 & K-3 II
09-04-2014, 06:00 AM
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I had a Tamron 28-75 2.8 that did the same thing when set on "A". I learned that there was a tiny (by tiny I mean like a hair width) bit of play while locked in the "A" mode. When bumped or touched it would move ever so slightly giving my K-3 the F--- reading. The only solution that I came up with was to use a lens band (or similar rubber type band) to wrap around the aperture rind to prevent it from shifting a hair and it worked. If that is the case and it is a new lens I would send it back if you can since you shouldn't have to deal with that. I picked the lens up for almost nothing because it had that problem so dealing with a rubber band around it didn't bother me.
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