Originally posted by creative69 Really? Are you really sure?
That would be a new behavior for Pentax and I seriously doubt it, as it would waste power holding the sensor in place even though there is no light hitting it. It could however be something new they found necessary due to the heavier sensor compared to APS-C and the jolt involved when moving the sensor right before the curtains open. But that is pure speculating.
So you are saying that if you half press, the sensor is lifted and held in place. And then if you stop pressing the button, the sensor audibly fall down again making a clunking noise when it drops to its lower position?
Can you also here a buzzing noise when you half press, indicating that the SR mechanism is actually active? (Compare with live view)