How does IS affect moving subjects?

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Duncan.F

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Duncan
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Hi,
Not quite sure about this! I understand that IS steadies a static image and can be used for panning shots. But what happens if you have IS on and the subject suddenly moves or indeed you have it switched on for an already moving subject?

Is there any advantage in the last 2 examples?

Cheers,

Dunc
 
Dunc

IS ( Canon style) detects movement of the lens. Servo motors then adjust optical components to reduce the amount of " Shake" Different lenses claim different amount of shake reduction, usually expressed in effective stops . For example with a 200mm lens you would normally use say a 1/250 second to stop camera ( hence lens) shake. The IS system will allow you to use a slower shutter speed say 1/60 , a 2 stop range, to give a similar image.

But you do need to be careful with these figures as they can give you a false sense of security. Personally I never go below 1/200 with my 100-400 IS lens, at long zoom unless its on a monopod, tripod or other support.

The IS system has nothing to do with subject movement, you'll still need a high shutter speed for stopping fast moving objects.
 
Yeah think of it as just a helping hand to hold the camera steady
 
Canon IS has two settings, the first for overall stabilisation and a second which will assist in one direction or the other ie panning vertically or horizontally on a moving subject.

Steve...
 
Thank you for your replies. I do a fair amount of sport some of which is indoors, Netball for example. I am considering buying the 70-200L 2.8 IS. Kerso has given me a good price!
At the moment I have the 70-200 F4 L and it struggles with the light in some situations.
Just trying to convince myself really!

Cheers,

Dunc
 
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