Originally posted by adwb lord not again how may threads do we need on this
Did you read the article or just blindly comment? I suggest giving the link a thorough read, as well as other members. I think it would answer the majority of questions related to the "poor" focusing of the Pentax (I think it does rather great given what kind of system it is).
The article is quite technical though. Those with a reactionary attitudes (cough cough
) might prefer some lighter reading.
From the introduction to the article:
"
The point I am trying to make is that the sensor will not be exactly where it is supposed to be, the mirror in an SLR will not come to rest in the perfect position, the autofocus system may be mounted just a wee bit off from the perfect position, it may be slightly out of perfect calibration, the focusing screen may be a little thinner or thicker than the spec, it may be placed slightly off in the camera, the lens mount may be slightly deeper or shallower than the spec, etc.
So, the consequence of mass production in large quantities at reasonable prices is that all these small deviations will pile up on top of each other and can cause the AF system in your camera to be out of focus. There is also a statistically significant probability that even if the autofocus system is working superbly, manual focus on the screen does not match the autofocus system on the camera."