K-30 Overblown exposures

You have to try some other A lens to know is this is the lens or the camera. On some A lenses the aperture lever which moves the aperture during the exposure is misaligned, causing exposure errors (usually constant over or under exposure). If the over-exposure becomes greater the smaller the aperture selected, the camera is unable to properly actuate lever at all (too stiff or out of position). Usually happens with old third party lenses in PKA mount, but it can happen with any A lens as well. The easiest solution is to just select the appropriate -EV amount and keep it on all the time with that problem lens. Using the lens in M position with stop-down metering usually under-exposes a little on most bodies, this is normal.