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General photography questions and answers: Discuss Image stabilisation...Almost always the advice is to turn off the IS when using a tripod. How does IS give an inferior ...
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Old 13-02-2010, 12:51   #1 (permalink)
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Image stabilisation

Almost always the advice is to turn off the IS when using a tripod. How does IS give an inferior image when used on a tripod?
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Old 13-02-2010, 13:51   #2 (permalink)
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Re: Image stabilisation

cos the tripod is doing the job for you......... if you have IS that enables panning then u can switch to that and use the tripod, but cos the tripod is essentially doing the job of the IS it is not needed.......... im sure someone will come along with a more technical explanation thoe! lol
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Old 13-02-2010, 14:00   #3 (permalink)
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Re: Image stabilisation

Thanks for the reply Fiona but it still begs the question if the tripod is doing the job, which it is, why do you need to turn the IS off? What is the disadvantage of leaving it on?
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Old 13-02-2010, 16:14   #4 (permalink)
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Re: Image stabilisation

The IS system works using a feedback loop and there will be some noise in such an electronic circuit. It is therefore likely that the noise in the circuit will cause very small corrective movements even when the camera is at rest. These small movements will be insignificant compared to the movements to correct real camera shake so will probably not be perceptible in the image but better still would be to switch off or disable the feedback when it is not needed.

What you actually need to do depends on the brand and make of lens. In the handbook for both my Canon IS lenses it is explained that when using a tripod, the lens detect no movement and the IS feedback is automatically disabled so there is no need to switch off. However, Canon recommend switching off to save battery power.
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Old 13-02-2010, 17:00   #5 (permalink)
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Re: Image stabilisation

Thanks for the answer Dave
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Old 14-02-2010, 08:53   #6 (permalink)
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Re: Image stabilisation

... From a simplified version of how Digital IS works as explained to me,
(and in saying that, if anyone can explain it better, feel free...)

If you draw a rectangle (Figures for illustration purposes only ) say 4x3 inch, then draw a slightly smaller one inside, say 3.9x2.9inch, the camera looks at the 4x3 image, and then draws the smaller one in its own "mind", which it "latches on" to the image it can see, keeping that smaller box stable, whilst allowing the camera to wobble the bigger box about round the outside as the camera moves.

Therefore, you are not using the whole of your sensor to take the photograph, only the bit in the middle that isnt "moving"....
That smaller box is only part of the sensor you have, as it uses the pixels outside the border of the visible frame to provide a buffer for the motion of the camera as its wobbles.

If you turn off the IS, you use the WHOLE of that imaginary 4x3 box to take the photograph... thus a better definition as you are effectively using a bigger sensor.........

Optical Image stabilisation, the "In the Lens" stuff, uses small gyroscopes or piezo velocity sensors to sense movement, and slightly shift a floating lens element to alter the path of the light to compensate, this is, as explained by Dave, as battery drain, but not that significant.
What is, or maybe, is that lens in motion, could alter the DOF available, and sometimes cause erratic results, especially creating shadow in out-of-focus areas...
It is therefore suggested that if the lens doesnt automatically cancel this, as you dont need it on a tripod, why not switch it off.

Does that make any sense?....
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Last edited by Silver Dragon; 14-02-2010 at 09:05. Reason: Typo.
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Old 14-02-2010, 16:16   #7 (permalink)
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Re: Image stabilisation

there you go i knew someone could explain it properly
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Old 14-02-2010, 16:56   #8 (permalink)
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Re: Image stabilisation

Thank you all for the replies
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Old 14-02-2010, 17:43   #9 (permalink)
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Re: Image stabilisation

Thank you also for your question and replies regarding IS.... So, If I understand you "lose" "sharpness"...ora full data, if you have it on and the camera on tripod?
 
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