I love SR, it does make a difference and occasionally a huge difference, but there are many variables that involve how efficient it may be.
Here at 1/20 hand-held 500mm, SR did wonders, but the light and a little luck, along with steadyhands also played a factor.....SR will not perform true miracles, it will make a good situation better.....but will not compensate for a bad situation. Anyhow, that is my findings.
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In my short 5-6 years as a DSLR shooter, or as a camera user in general....what I have learned to be most important in many situations, most in fact, is speed. If you can get speed, you can eliminate two of the biggest problems.......movement and movement.
Fortunately, the K5 allows speed that was previously not possible...gotta love that!
Best Regards!