Originally posted by Malake Hello. I'm wondering if K-5 owners could talk about effectiveness of Shake Reduction, and to post some pics. I'm coming from Nikon and certainly VR is a good tool (about 3 steps). Thanks
The effectiveness of Pentax SR is an interesting question. I'll probably do a quantitative test of it when time permits.
From my measurements for the K-7 and my first results for the K-5, I'll say it depends. My impression is as this:
For tele lenses you may expect about 2 stops if you stay faster than maybe 1/160s.
Between 1/160s and 1/40s, I'd say it is between 1 and 2 stops depending on the focal length (better for longer focal lengths but then, a shorter focal length doesn't need much improvement here).
Below 1/40s, the gain seems to be 2 to 3 stops with a "sweet spot" around 1/15s where the gain can exceed 3 stops indeed.
With respect to lens base IS, there are lenses outperforming Pentax SR and vice versa. It will really depend on the lens and its focal length and deployed shutter speed.
For any SR or IS, it is good advice to attempt 2 or 3 shots in the critical region. The difference between best and worst shot is always significant (probably by more than a stop different) due to the nature of shake physics.