Pentax smc DA 12-24mm F4.0 ED AL (IF)

Announced Mar 15, 2005 •
Wideangle zoom lens | Pentax KAF | 21577
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I recently got this re-branded 12-24mm f/4 lens and I have an issue with it. This lens is intended for Samsung cameras but I understood that it is fully compatible with Pentax bodies. I am using it on a K-x body. So, the front element of the lens can move inward/outward a millimeter or so, and that messes up the focus. If the lens is pulled towards the body, then infinity becomes less than 2m and when the lens is pulled away from the body, it function correctly. The autofocus is not reliable...
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