Shake Reduction Question

jgredline · 01-02-2008, 06:46 PM

Originally posted by Workingdog

JG, so you're saying that the AF is definitely quicker with SR turned off? What about fps?

Yep. I would say try it for your self. I have read that the shake reduction is worth 1 to 2 stops...What does this mean exactly...On my fast lenses it is faster with the shake reduction off. No doubt about it. Shake reduction in low light, really slows up the auto focus. I have also heard this to be true of image stabilized lenses for both canon and nikon so It is not a pentax problem..I think it is simple physics..Before it fires it must stabilize.
I also read that when using flash, to turn of the shake reduction...I have down this and the camera responds very quickly and the pics are sharp.

These 4 shots were taken at the zoo last week with no shake reduction. My little K100D super was kicking but. No way would I have got this sequence with shake reduction on. I may have gotten three pics, but not four...These were also shot at ISO 800

Last edited by jgredline; 01-02-2008 at 07:43 PM.

Rickster · 01-02-2008, 07:35 PM

Originally posted by Workingdog

JG, so you're saying that the AF is definitely quicker with SR turned off? What about fps?

Rickster, can we see that laser test with the laser panning on a tripod and you following it with the camera handheld?

I need to find a small geared down motor to swing the laser. Will post here if I find one.

Workingdog · 01-02-2008, 07:51 PM

I was thinking something a little more low tech, like a helper, to swing the laser

m8o · 01-02-2008, 08:14 PM

Rickster, that laser idea on the previous page was a clever one. Answers it very clearly there. As Cartman would say... Kick A**!

Rickster · 01-02-2008, 08:51 PM

Originally posted by Workingdog

I was thinking something a little more low tech, like a helper, to swing the laser

All I have for 'helpers' around here are two cats. They do swing their tails a lot but ...

I asked Jack and he did his "LOL" thing ...

mattdm · 01-02-2008, 08:55 PM

Originally posted by jgredline

I have read that the shake reduction is worth 1 to 2 stops...What does this mean exactly...

It means what it says. Each "stop" is double the amount of light of the previous, so two stops means you can work with a quarter of the light you could normally. Since shake reduction works against shutter speed, this means you can double (one stop) or quadruple (two stops) the exposure time without getting blur from camera shake.

I don't think enabling SR should slow things down, because the camera will happily fire before stabilization is active — if you want it to work, though, you have to wait a few seconds after half-press for the SR icon to light before taking the shot.

Rickster · 01-02-2008, 08:55 PM

Originally posted by m8o

Rickster, that laser idea on the previous page was a clever one. Answers it very clearly there. As Cartman would say... Kick A**!

It's an 'occupational hazard' with me ... I'm a retired engineer. (E.E. type )

Rickster · 01-02-2008, 08:57 PM

Originally posted by jgredline

[snip]
These 4 shots were taken at the zoo last week with no shake reduction. My little K100D super was kicking but. No way would I have got this sequence with shake reduction on. I may have gotten three pics, but not four...These were also shot at ISO 800

Wonderful series!!! You did good!

JCSullivan · 01-03-2008, 05:33 AM

Originally posted by Rickster

I asked Jack and he did his "LOL" thing ...

Now I need a new k'board - not often anyone gets me laughing out loud.

Anywho, you could hang the lazer from the ceiling and have the cats take a swing at it - that will move it non!

Geyst · 01-03-2008, 09:15 AM

Did you tape the laser to the lens or did you had somebody to help you?

Guido

Originally posted by Rickster

If the laser is attached to the camera and SR is off you should see a dot. When SR is turned on you should see the relative motion of the CCD to the laser. (I think)

If the laser is mounted on a tripod and swept horizontally you would see a line or if panning a dot. The presence or lack of "wriggles" in the captured image should give an indication of the SR effect.

OK ... I did a quick and dirty test ... I was panning in both images a plain wall.

Here's the image with SR off ... as expected there is a dot (the laser is a cheapie so the dot is not perfectly round)

Here's the image with SR on - we can see the camera shifted the CCD to compensate for hand shake.

Rickster · 01-03-2008, 11:31 AM

Originally posted by Geyst

Did you tape the laser to the lens or did you had somebody to help you?

Guido

The laser pointer was affixed to the flash mount aligned pretty much in the center of the field of view. Makes a decent AF target that way.

01-02-2008, 07:35 PM	#17
Rickster Veteran Member Join Date: Jun 2007 Location: SE Idaho - Rocky Mtns Photos: Gallery Posts: 580	Originally posted by Workingdog JG, so you're saying that the AF is definitely quicker with SR turned off? What about fps? Rickster, can we see that laser test with the laser panning on a tripod and you following it with the camera handheld? I need to find a small geared down motor to swing the laser. Will post here if I find one. Last edited by Rickster; 01-02-2008 at 08:59 PM.

01-02-2008, 08:51 PM	#20
Rickster Veteran Member Join Date: Jun 2007 Location: SE Idaho - Rocky Mtns Photos: Gallery Posts: 580	Originally posted by Workingdog I was thinking something a little more low tech, like a helper, to swing the laser All I have for 'helpers' around here are two cats. They do swing their tails a lot but ... I asked Jack and he did his "LOL" thing ... Last edited by Rickster; 01-02-2008 at 08:58 PM.

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01-02-2008, 06:46 PM	#16
jgredline Veteran Member Join Date: Oct 2007 Location: LosAngeles, Ca. Photos: Albums Posts: 10,628	Originally posted by Workingdog JG, so you're saying that the AF is definitely quicker with SR turned off? What about fps? Yep. I would say try it for your self. I have read that the shake reduction is worth 1 to 2 stops...What does this mean exactly...On my fast lenses it is faster with the shake reduction off. No doubt about it. Shake reduction in low light, really slows up the auto focus. I have also heard this to be true of image stabilized lenses for both canon and nikon so It is not a pentax problem..I think it is simple physics..Before it fires it must stabilize. I also read that when using flash, to turn of the shake reduction...I have down this and the camera responds very quickly and the pics are sharp. These 4 shots were taken at the zoo last week with no shake reduction. My little K100D super was kicking but. No way would I have got this sequence with shake reduction on. I may have gotten three pics, but not four...These were also shot at ISO 800 Last edited by jgredline; 01-02-2008 at 07:43 PM.

01-02-2008, 07:51 PM	#18
Workingdog Veteran Member Join Date: Dec 2007 Location: York, PA Photos: Gallery Posts: 736 Original Poster	I was thinking something a little more low tech, like a helper, to swing the laser

01-02-2008, 08:14 PM	#19
m8o Veteran Member Join Date: Jul 2007 Location: 40°-55'-44" N / 73°-24'-07" W [on LI] Photos: Gallery \| Albums Posts: 3,092	Rickster, that laser idea on the previous page was a clever one. Answers it very clearly there. As Cartman would say... Kick A**!

01-02-2008, 08:55 PM	#21
mattdm Veteran Member Join Date: Feb 2007 Location: Boston, MA Photos: Gallery Posts: 2,948	Originally posted by jgredline I have read that the shake reduction is worth 1 to 2 stops...What does this mean exactly... It means what it says. Each "stop" is double the amount of light of the previous, so two stops means you can work with a quarter of the light you could normally. Since shake reduction works against shutter speed, this means you can double (one stop) or quadruple (two stops) the exposure time without getting blur from camera shake. I don't think enabling SR should slow things down, because the camera will happily fire before stabilization is active — if you want it to work, though, you have to wait a few seconds after half-press for the SR icon to light before taking the shot.

01-02-2008, 08:55 PM	#22
Rickster Veteran Member Join Date: Jun 2007 Location: SE Idaho - Rocky Mtns Photos: Gallery Posts: 580	Originally posted by m8o Rickster, that laser idea on the previous page was a clever one. Answers it very clearly there. As Cartman would say... Kick A**! It's an 'occupational hazard' with me ... I'm a retired engineer. (E.E. type )

01-02-2008, 08:57 PM	#23
Rickster Veteran Member Join Date: Jun 2007 Location: SE Idaho - Rocky Mtns Photos: Gallery Posts: 580	Originally posted by jgredline [snip] These 4 shots were taken at the zoo last week with no shake reduction. My little K100D super was kicking but. No way would I have got this sequence with shake reduction on. I may have gotten three pics, but not four...These were also shot at ISO 800 Wonderful series!!! You did good!

01-03-2008, 05:33 AM	#24
JCSullivan Veteran Member Join Date: Sep 2006 Location: Windsor, Canada Posts: 3,056	Originally posted by Rickster I asked Jack and he did his "LOL" thing ... Now I need a new k'board - not often anyone gets me laughing out loud. Anywho, you could hang the lazer from the ceiling and have the cats take a swing at it - that will move it non!

01-03-2008, 09:15 AM	#25
Geyst Senior Member Join Date: Jul 2007 Location: Maaseik, Belgium Photos: Gallery Posts: 158	Did you tape the laser to the lens or did you had somebody to help you? Guido Originally posted by Rickster If the laser is attached to the camera and SR is off you should see a dot. When SR is turned on you should see the relative motion of the CCD to the laser. (I think) If the laser is mounted on a tripod and swept horizontally you would see a line or if panning a dot. The presence or lack of "wriggles" in the captured image should give an indication of the SR effect. OK ... I did a quick and dirty test ... I was panning in both images a plain wall. Here's the image with SR off ... as expected there is a dot (the laser is a cheapie so the dot is not perfectly round) Here's the image with SR on - we can see the camera shifted the CCD to compensate for hand shake.

01-03-2008, 11:31 AM	#26
Rickster Veteran Member Join Date: Jun 2007 Location: SE Idaho - Rocky Mtns Photos: Gallery Posts: 580	Originally posted by Geyst Did you tape the laser to the lens or did you had somebody to help you? Guido The laser pointer was affixed to the flash mount aligned pretty much in the center of the field of view. Makes a decent AF target that way.

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