[Ex Finn.]

And that Jack might influence stability also... That`s a nice and clean ashtray you have there. Smoke a lot, somehow I doubt it

[honey bo bo]

I've always had shaky hands too - wish I knew why.

Me thinks its the Shallow Alarm going off in your decanter ; that and the Church Bell Clanging next door does it for me and then I need more than 5 stops !

[Lowell Goudge]

I can hand hold a 50 mm lens at 1/30s. proven in dozens of film and digital images.

So, one stop better
1/15s

Two stops better
1/8s

Three stops better
1/4s

Four stops better
1/2s.

That would be just nonsense. I still can't hand hold better than 1/8s using any of my SR bodies. SO where does this 4 or 5 stop thing count?

Norm

See the attached. Link. 500 mm at 1/40 and that was a k7. It is possible but it rewards technique. First two shots of the heron

Pentax K 300mm f/4 samples - PentaxForums.com

[Just1MoreDave]

Sometimes the manufacturer throws in the word "steps" instead of "stops". Scroll down on this page about the K-3 II:

PENTAX K-3 II

Is a step a stop? Or is it a half or third stop depending on how your camera is set up? That CIPA standard says they should use stop.

Everyone has their own steadiness and should test it.

[luftfluss]

That's easy, quit using old manual typewriters! Banging on the keys for any length of time causes instability.

And that Jack might influence stability also...

[35mmfilmfan]

I never realised manual typewriters were subject to the affluence of incahol

[jack002]

You may think SR doesn't do much, try putting on a long lens, then plug in your vid cord to see it on a TV and hold as still as you can with and without SR, its a big difference. 5 stops? I don't think its that much.

[LensBeginner]

I never realised manual typewriters were subject to the affluence of incahol

Only of hotels built in strange places...

[Kevin B123]

I can hand hold a 50 mm lens at 1/30s. proven in dozens of film and digital images.

So, one stop better
1/15s

Two stops better
1/8s

Three stops better
1/4s

Four stops better
1/2s.

That would be just nonsense. I still can't hand hold better than 1/8s using any of my SR bodies. SO where does this 4 or 5 stop thing count?

I thought the count would start at 1/ focal length on FF or 1/1.5x focal length on APS-C where SR is not needed? that would make it 1/4s to 1/8s respectively which is pretty good. I agree also that longer focal lengths is where we really score.
At 1/2 second it had better be on a tripod or you want ICM,?

[LensBeginner]

I thought the count would start at 1/ focal length on FF or 1/1.5x focal length on APS-C where SR is not needed? that would make it 1/4s to 1/8s respectively which is pretty good. I agree also that longer focal lengths is where we really score.
At 1/2 second it had better be on a tripod or you want ICM,?

He started at the speed he can actually hand-hold without SR in order to evaluate SR benefits.
That is more real-life than some abstract "safe speed" which may or may not apply to real life situations.

[Kevin B123]

He started at the speed he can actually hand-hold without SR in order to evaluate SR benefits.
That is more real-life than some abstract "safe speed" which may or may not apply to real life situations.

Fair enough of course, it's just that this example ends up too slow to be viable even with a 15mm lens. I have managed to get blurry images with a DA15 at faster shutter speeds entirely my fault through lack of technique that time.

[LensBeginner]

Fair enough of course, it's just that this example ends up too slow to be viable even with a 15mm lens. I have managed to get blurry images with a DA15 at faster shutter speeds entirely my fault through lack of technique that time.

First one looks OoF but steady to me, that's not motion blur.

[RobA_Oz]

Every photo taken is subject to a degree of motion blur. We just don't notice it much of the time because of the resolution limits imposed by the sensor or film, and the lens, or simply because we don't often enlarge our images beyond a comparatively small size. I imagine that, with the increased capability of the K-1 (and now KP) sensor, those extra effective stops of shutter speed provide a noticeable improvement in high magnification images.

There are obvious lower limits on the speed below which SR becomes useful, but you don't buy a Bugatti Veyron expecting it to generate 1000 BHP at 500 rpm.

[wildman]

What do they mean when they say Shake Reduction adds4 stops of performance?

In word - Humbug

[LensBeginner]

*snip*

There are obvious lower limits on the speed below which SR becomes useful, but you don't buy a Bugatti Veyron expecting it to generate 1000 BHP at 500 rpm.

I don't know... do they make an agricultural version? in a John Deere green trim?