My K-r shows noticeable front focus on both my DA L 18-55mm and 55-300mm lenses, and when using my Vivitar 50mm f/1.7 lens, taking a picture at the point where the focus confirmation beep and hexagon appear results in a front focused image. This happens under all lighting conditions and cannot be corrected using the AF fine adjust (-10, front focus still visible).
I called PENTAX Imaging regarding this issue, and I was told to send in the camera along with both PENTAX lenses (PENTAX cannot service the Vivitar lens) for AF calibration under warranty. Turnaround time was given at 3-4 weeks.
The problem is not normally serious in most situations because there is enough depth of field to compensate, but the Vivitar 50/1.7 has shallow enough DOF such that the AF confirm point is obviously front focused. Should I send in my camera, or should I wait or perhaps choose a service center other than C.R.I.S. (the PENTAX central service center)?
--DragonLord
Last edited by bwDraco; 12-22-2010 at 04:57 PM.
Reason: Minor wording fix