I posted the poll above to show some of my fellow PF members that our knowledge of the SR system may not be as complete as it should be. At the end of this message, i'll give you what i think is the correct answer to this poll. Please take this poll without looking up or testing your camera first. Its for your own amusement - if anything.
==================
With that out of the way, Member tuco posted this link to a Thom website article on the VR system (in the Other Manufacturer forum), when to use it and when not to use it. The reason i repost the link on the K5 site is to demonstrate that these body SR and lens VR type systems are far more complicated and difficult to use than i ever originally imagined. Without further ado, the link:
Nikon VR explained
Again, I don't want to start a comparison between SR and VR - thats not the point, its just that i began to wonder after reading about the VR system, if Pentax's SR system had similar technical difficulties in certain situations that many of us were not aware of.
Could it be that some of the blurred picture problems that folks attribute to phase AF may instead be due to improper use of the SR system? (I don't know the answer to that question, or how to tell SR bluriness problems from lack of focus problems (other than BF or FF - i could recognize that)
So first thing i did was to go to my K5 manual and read this summary on page 139 and following,
1. advantageous in dimly lit situations
2. advantageous on telephoto lenses (this is different from what i read on some threads, but not others
)
3. Not useful for subject motion blurring
4. may not fully reduce shaking in close up shots
5. will not fully work on with slow shutter speeds, e.g. panning or night shooting
6. the SR function will not fully work for about 2 seconds after power is turned on or when recovering from Auto Power off.
OK - NOT IN THE K5 MANUAL is something i discovered tonight, after 8 months of owning the K5. If you set the meter power off function to a short value like 5 seconds, you will notice the SR hand disappears when the the meter powers off and it takes about 2 seconds for the SR to recover itself. If you are snapshooting street scenes and have a shutter speed that relies on SR, you may be taking photos before the SR function has a chance to power up. POSSIBLE SOLUTION: Either don't use SR, set a long meter on time, or keep your finger on the shutter button if there is a chance you will be snapping a photo off quickly
In any case, I hope that either Pentax or someone on this forum could provide better guidance on when to avoid using the SR function on the later dslrs. I don't think the Pentax guidance is adequately complete.
I actually like Thom's guidance on Nikon VR usage, Rule number 1,
Quote: The first and most important rule of VR is this: never turn VR on
Quote: unless it's actually needed.
Perhaps we Pentax owners need to adopt a similar rule
I do know that I experienced a high rate of non-blurry pictures when i turn off SR (on my K20 and now the K5) for shooting play rehearsals and instead rely on shutters from 1/100s to 1/200s, whatever i can get away with consistent with exposure requirements and camera ISO abilities. This is totally annecdotal but over several plays worth of photos. I haven't set up any kind of objective comparison test - not exactly sure how one could do that.
Last edited by philbaum; 12-28-2011 at 12:43 AM.