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Olympus E-3 E-3 specific discussion.

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  #1  
Old 14th July 2012
richardlongley
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IS - why turn it off

I saw a post recently, and the comment was suggesting that IS should be turned off when shooting from a tripod.


Can someone help me understand - I can understand taking off the IS when you are tracking a moving object, but is there any other time that IS is a dissadvantage???
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Old 14th July 2012
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Re: IS - why turn it off

IS is designed to counter human movement - a tripod should be vibration free hence no need for IS and it can cause IS induced imperfection in the image.

Also there has been comments that portrait format images challenge the IS system and if possible should be disabled.

You have to balance the benefit of IS ie hand held shooting at a low shutter speed
versus any defect in the IS based image.

I did not learn of these problems until I had finished using my E3 but looking back I can see some portrait format pictures not being as sharp as they should be given the shutter speed used

I use IS now only when the shutter speed is slow or I am a bit shaky.
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Old 14th July 2012
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Re: IS - why turn it off

It is recommended to turn off IS when using a tripod because it is claimed that the IS system "hunts for any movement" and can degrade the image when there is no movement. How true that theory is I don't know but certainly the concensus is that you shouldn't use IS with a tripod.

I must do a comparison test and see what the results are.

Steve
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Old 14th July 2012
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Re: IS - why turn it off

There is aso the point that IS uses battery power and generates heat.

Try doing a long exposure on a tripod with IS on - you can hear the poor thing pointlessly working. My belief is that it does marginally degrade sharpness and the extra heat contributes to noise - but I've never done the comparison shots to prove it.

Nick
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Old 14th July 2012
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Re: IS - why turn it off

Why turn IS on? I use a tripod/camera support for 98 percent of my shots and rarely turn it on for any of the other 2 percent.
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Old 14th July 2012
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Re: IS - why turn it off

I certainly notice a degrading of the IQ when the shutter speed is above 1/320 and also if I try to hold the camera too steady or I have some arm support. This is both on the E5 and E-M5.

David
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Old 14th July 2012
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IS will ruin long exposures, at least. (e-620}
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Old 14th July 2012
richardlongley
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Re: IS - why turn it off

Thanks guys, really helpful.

I will swith off IS when I don't need it.
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Old 14th July 2012
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Re: IS - why turn it off

I have done a few non scientific tests while waiting for wildlife to arrive.
Where I wait it's always quite dark and I use a monopod while sitting on a log BUT pretty well supported and I had noticed that some of the shots seemed a bit shaky so I turned the IS off and took a few shots at various (still) subjects with it On and Off and the IS ones WERE not as good.
So if I get time I try and shoot with it On and Off to maximise my savers...I hope.
Keith
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Old 2nd August 2012
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Re: IS - why turn it off

Does anyone know if this applies to the E-M5? As I understand it, when the camera is turned on, the sensor is floating and always held in place electronically. Does that mean that the image is always subjected to the electronic 'movement' associated with the IS mechanism? Or does it mean that turning on the IS makes no difference?
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Old 2nd August 2012
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Re: IS - why turn it off

Quote:
Originally Posted by Frank N Furter View Post
Does anyone know if this applies to the E-M5? As I understand it, when the camera is turned on, the sensor is floating and always held in place electronically. Does that mean that the image is always subjected to the electronic 'movement' associated with the IS mechanism? Or does it mean that turning on the IS makes no difference?
Yes this applies to the E-M5. I believe that when the camera is turned on the sensor is supported by Fixed magnetic fields holding it in a fixed position. When IS is switched on signals from the gyros, or whatever motion sensors are used are applied via a servo control loop to vary the magnetic fields and move the sensor to compensate for camera movement.

Regards.
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Old 3rd August 2012
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Re: IS - why turn it off

This question comes up on a regular basis - all I can say is that I never use it, basically because I forget it it's there. On the one time I tried it I can't say whether it helped or not - what I can say is that because I forgot to turn it off again the next photo session, long exposures on a tripod in a church, was ruined because of it. I could hear something going on in the camera and thought it was broken!!. A re-shoot with it turned off was fine. In conclusion - I have no idea why it should be turned off on a tripod - but it should be
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Old 3rd August 2012
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Re: IS - why turn it off

I've never been impressed by the IS in the E-3 or E-5, at any shutter speed. Maybe it's just something to do with my particular technique, I don't know. But with the EM-5 it seems to work really well - I just leave it on all the time and haven't noticed any ill effects. Although I have not done any tripod work with it.

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Old 3rd August 2012
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Re: IS - why turn it off

I leave IS on all the time on my E-M5, except if I'm using a tripod. But I've yet to use a tripod with the E-M5 because the IS is so good ...

If I was doing a panning shot or a C-AF series I'd turn it off, because something inside my "common sense" cell tells me that it may slow things down. Probably total rubbish.
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Old 4th August 2012
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Re: IS - why turn it off

Just to illustrate the point, here are two shots I took yesterday of a Common Tern at some distance with E-M5 IS on and off. These were at 300mm taken handheld but with my elbows resting on a bird hide shelf. I took 10 at each setting and the results were all about the same. The shutter speeds were 1/250 and 1/320 - the sort of speed you would expect to use IS for on a 300mm. Both cropped to 100%.

IS on:



IS off:



This obvious difference would be fairly critical in any situation where large crops are required, such as wildlife photography. Close examination shows that there is more noise in the IS on image. I might add that although results such as these sometimes appear with the E5 under these conditions it is much less often and much less marked.

David
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