Shake Reduction when using high shutter speeds

We all know the benfits of shake reduction at low shutter speeds but is there any benefit to using it at high shutter speeds? I always keep it switched on but is it feasible that at a high shutter speed SR could actually induce some blur particularly if you take a shot as it tries to stabilize? Has anyone doen any tests?

Before anyone says it I know that SR will stop amoving object from being blurred.

Thanks!

Interesting question. I don't know if the SR engages at high shutter speeds with short lenses?

It stabilize itself before you fully press the shutter release (usually)
Also under such condition the SR hardly has time to make a mistake.
If it can keep the sensor still with long shots why not with short shots?

It will always engage when it is set on on except with delayed shooting and when using a remote.

I leave it on all the time and have had no problems, and from what I've read the SR is in a menu now on the K7 so I would surmise that pentax don't think there's any problem with leaving it on all the time (nb I expect auto off for mirror lock up) Not done any specific tests.

PS you might want to re-phrase the "before....blurred" bit !

I have only found issues when the "AF on halfpress" is disabled in the custom menu. If you pushed the shutter button too quickly, then SR could blur the shot if it hasn't stabilised.

However, Pentax released an updated K20D firmware that fixes that issue
So now I leave SR on

Matt

I don't get what you're saying, or I don't understand how SR works, which is very possible.
Surely the sensor can't be stable before the shutter is pressed as I presume it needs to be correcting in the opposite direction of the camera body movement for the time the shutter is open. So it's only when the shutter is pressed that it *starts* doing it's stuff. I don't see why the shutter speed should affect it's ability to make a mistake in that respect, or as you suggest, why SR shouldn't work just as well on shorter speeds. After all, the camera body isn't being vibrated more rapidly, it's just doing the same SR for a shorter period.

SR by and large seems to work very well, but I still take several shots to select the best, whenever that is possible.

I have a feeling (hard to prove without a lot of work) that the ultimate sharpness is still achieved with SR switched off and the camera firmly mounted on a very solid tripod.

I thought the idea behind SR was to add options by increasing slow shutter speed and small aperture availability. While it might be engaged at high shutter speed, would it operate or work out that it's not needed?

It might be needed even at a high shutter speed with a long lens.

The question is - does it work? It seems to.

[quote:3496ace15f="bladerunnerukI leave it on all the time and have had no problems, and from what I've read the SR is in a menu now on the K7 so I would surmise that pentax don't think there's any problem with leaving it on all the time (nb I expect auto off for mirror lock up) Not done any specific tests.

PS you might want to re-phrase the "before....blurred" bit ![/quote]Whoops!!! I said exactly the opposite to what I meant and should have said:"Before anyone says it I know that SR will not stop moving object from being blurred."

I'm glad that someone is paying attention!

I must admit that I find that concept difficult! So, does the following happen? SR stabilizes, hexagon lights up and then does the SR continue to make fine tuning adjustments until the shutter is released?

I would venture to suggest that there could be an alogrithm that makes it work less at high speeds and at shorter focal lengths. After all when using a manual lens one has to input the focal length.

The SR sytem adjusts itself for varying focal lengths. As DELTIC days some lenses need the FL inpitting so the sytem knows how much to compensate.

I'm afraid I can't join your technical "when does it start working" conversation, but all I can say is that I have always had SR on when my camera's not on a tripod - no matter what lens I am using or how slow/fast the shutter speed.

I have never had blurry shots caused by the SR system stabilising or adjusting itself. I don't know how SR works, I just know it works for me all the time when I'm handheld.

I always notice when SR is accidently off when taking photos, there is a slight blur of movement in my shots, this isn't as obvious the higher the shutter speed - I guess it just depends on whether you shake a lot when taking photos!

If I get a chance I might do some tests tomorrow and post the results.

I was going to point this out too! I had asumed that the SR system took into account the focal length and the currently selected shutter speed. This is why using SR on a tripod with low shutter speed causes problems.