In the k5 series body image stabilisation in movie mode is realized using the mechanical SR system.
In the k-01/k30/50 etc it is realized using a badly implemented software based SR that crops the sensor by about 1.3X and is prone to severely exaggerated "jello" effects.
This change was most probably done to reduce noise from the SR system during filming, However I find this noise to be so low in practice as to be negligible, and that the mechanical system offers much more efficient stabilization.
I was hoping Pentax would continue with the mechanical SR mode in video mode in the k3 as it is simply better, however the hands-on video below you can clearly see that (at 1:53 into the video) the camera crops the live view image both vertically and horizontally when entering movie mode (more than is required simply due to change of aspect ratio).
This suggests that the same compromised software SR mode is being used in the k3. I find this really frustrating as it is a serious step back compared to the k5 stabilization solution.
I hope this can be changed in a firmware update if users are aware of the compromise and more vocal about their preference. Otherwise the k3 can be considered crippled compared to the competition - namely the olympus em-5/em-1 which offer very effective mechanical SR in video mode.
Pentax K-3: toma de contacto | Quesabesde
Furthermore looking at 5:13 into the video you can see real footage from the K3 and there is obvious exaggerated "jello" to be seen, and poor quality. This is a really stupid move by the designers if they are hoping to make the k3 a serious movie camera.
And on another point the reviewer has mentioned that new the AF system "is slower than desired". This seems to corroborate with the opinion of some other reviewers. It does not bode well for the improved AF tracking performance of the k3.
Last edited by Ayoh; 10-17-2013 at 07:11 PM.