What's causing this?
Posted 23/11/2010 - 13:56
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George Lazarette wrote:
Sounds plausible to me.
Yes, and to me (and in fact I've never questioned the plausibility of the mechanism, just whether it's real or not). Kudos to Canon for being upfront about it.Sounds plausible to me.
It still isn't evidence for a real effect in Pentax world. And I certainly won't be changing how I work on the tripod for several reasons:
- Pushing the button with no delay (with or without SR) induces shake anyway which I don't want
- Eliminating shake requires a delayed or remote mode which overrides the SR switch anyway
- Why have wear and tear on the SR switch for no practical reason
And much more to the point...
- I can guarantee to ruin more shots by forgetting to switch SR back on for the hand-held shots
.
Pentax K-3, DA18-135, DA35 F2.4, DA17-70, DA55-300, FA28-200, A50 F1.7, A100 F4 Macro, A400 F5.6, Sigma 10-20 EXDC, 50-500 F4.5-6.3 APO DG OS Samsung flash SEF-54PZF(x2)
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Pentax K-3, DA18-135, DA35 F2.4, DA17-70, DA55-300, FA28-200, A50 F1.7, A100 F4 Macro, A400 F5.6, Sigma 10-20 EXDC, 50-500 F4.5-6.3 APO DG OS Samsung flash SEF-54PZF(x2)
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Posted 23/11/2010 - 14:00
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Your last point is a very strong one.
G
G
Keywords: Charming, polite, and generally agreeable.
Posted 23/11/2010 - 16:15
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Anvh wrote:
Not from Pentax but from Canon.
The system is slightly different but the mechanics behind it are the same it seems.
Instead of lens group use sensor
“The IS mechanism operates by correcting shake. When there is no shake, or when the level of shake is below the threshold of the system’s detection capability, use of the IS feature may actually *add* unwanted blur to the photograph, therefore you should shut it off in this situation. Remember that the IS lens group is normally locked into place. When the IS function is active, the IS lens group is unlocked so it can be moved by the electromagnetic coil surrounding the elements. When there’s not enough motion for the IS system to detect, the result can sometimes be a sort of electronic ‘feedback loop,’ somewhat analogous to the ringing noise of an audio feedback loop we’re all familiar with. As a result, the IS lens group might move while the lens is on a tripod, unless the IS function is switched off and the IS lens group is locked into place.”
So it's maybe a feedback loop, sounds plausible.
I have tried with a prime 300mm coupled with the 1.4TC. and also a 70-200mm zoom. Quite extensively. Again my conclusions were the same. No difference at all, leaving IS on or off whle on a tripod. And although it wasn't a scientific test I carried but definitely it was a very methodical and extensive test. I wanted to make sure once and for all what the whole thing was. Was tired of forgetting my IS off when taking it off the tripod and shooting handheld.
Not from Pentax but from Canon.
The system is slightly different but the mechanics behind it are the same it seems.
Instead of lens group use sensor
“The IS mechanism operates by correcting shake. When there is no shake, or when the level of shake is below the threshold of the system’s detection capability, use of the IS feature may actually *add* unwanted blur to the photograph, therefore you should shut it off in this situation. Remember that the IS lens group is normally locked into place. When the IS function is active, the IS lens group is unlocked so it can be moved by the electromagnetic coil surrounding the elements. When there’s not enough motion for the IS system to detect, the result can sometimes be a sort of electronic ‘feedback loop,’ somewhat analogous to the ringing noise of an audio feedback loop we’re all familiar with. As a result, the IS lens group might move while the lens is on a tripod, unless the IS function is switched off and the IS lens group is locked into place.”
So it's maybe a feedback loop, sounds plausible.
Amin Photo Gallery
Posted 24/11/2010 - 08:07
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Amin like he explains it doesn't need to happen all the time but there is a change it might happen.
So if you're making photos with SR on a tripod and one (out of a 100) is fuzzy then SR might be that caused it.
So if you're making photos with SR on a tripod and one (out of a 100) is fuzzy then SR might be that caused it.
Stefan
K10D, K5
DA* 16-50, DA* 50-135, D-FA 100 Macro, DA 40 Ltd, DA 18-55
AF-540FGZ
K10D, K5
DA* 16-50, DA* 50-135, D-FA 100 Macro, DA 40 Ltd, DA 18-55
AF-540FGZ
Posted 24/11/2010 - 08:32
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Anvh wrote:
Amin like he explains it doesn't need to happen all the time but there is a change it might happen.
So if you're making photos with SR on a tripod and one (out of a 100) is fuzzy then SR might be that caused it.
Thanks Stefan,Amin like he explains it doesn't need to happen all the time but there is a change it might happen.
So if you're making photos with SR on a tripod and one (out of a 100) is fuzzy then SR might be that caused it.
Yup, I see the point and I really cannot dispute that.
And yes I agree, ideally SR should be turned off when on tripod.
Amin Photo Gallery
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