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Forum: Pentax DSLR Discussion
11-20-2012, 12:56 PM
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On the K-30, apart from moving left<>right and up<>down it can also rotate (clockwise/anticlockwise) by a few degrees. On the K-r the mechanism can also rotate the image sensor it cannot actually sense rotational movement so does not compensate for it. The K-r only uses the rotational in conjunction with the O-GPS1 for the star tracking function - in all other situations the rotational movement is locked.
On the K-30 the clockwise/anticlockwise motion is used to compensate for rotational shake and also for automatic horizon correction.
edit forgot to mention:
The K-30 can actually sense translational movement so in that respect it could compensate for shake in macro shots but there is a snag. The Pentax autofocus system has no knowledge of the absolute focus distance as the lenses do not report it. The lens only gives a very rough indication, such as far, medium distance, near or macro. To correctly compensate for translational movement the camera would need to know the actual subject distance to within a few mm. In theory one could design it so that the photographer manually enters the subject distance but it would not be practical at all and not worth the bother.
There are some clever things that Pentax could do to get the camera to know focus distance but I doubt they would find it worth doing and in any case it would need very detailed lens information tables to be stored in the camera.
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