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Best way to take advantage of the 2-3 stop gain of my IS lens?
I want to get more from my Canon 24-105 f/4L IS lens at lower light and one idea is to take advantage of the IS more than I have been. I usually use aperture value mode and this selects a shutter speed for me. Can I compose my shot in aperture value mode, look to see what shutter speed it chooses, and then switch to manual mode and use the same aperture setting with a shutter speed 2 or 3 times faster than what it would have chosen for me? Or has the camera already factored in the IS when it makes the exposure settings in aperture value mode?.

Thanks in advance for your comments and/or suggestions..

Jameshttp://www.flickr.com/photos/buddhafinger/..

Comments (6)

James Adams wrote:.

I want to get more from my Canon 24-105 f/4L IS lens at lower lightand one idea is to take advantage of the IS more than I have been. Iusually use aperture value mode and this selects a shutter speed forme. Can I compose my shot in aperture value mode, look to see whatshutter speed it chooses, and then switch to manual mode and use thesame aperture setting with a shutter speed 2 or 3 times faster thanwhat it would have chosen for me? Or has the camera already factoredin the IS when it makes the exposure settings in aperture value mode?.

IS is irrelevant to exposure. If you want to increase your shutter speed, you will have to open up your aperture..

The best way to use IS: Shoot like you don't have it..

Remember: IS is not a substitute for a tripod. It is not a substitute for higher shutter speeds (ie, it will not freeze subject motion). It is not a panacea. It does not 'guarantee' a stable image. It is merely a tool to help increase your number of keepers when hand holding the camera. It is a wonderful tool, but it is not an excuse for sloppy technique..

Thanks in advance for your comments and/or suggestions..

Jameshttp://www.flickr.com/photos/buddhafinger/.

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Comment #1

Yep, the camera is smarter....

I suggest you go ahead with your plan and try it out. But I can predict: the only way to get correct exposure is if you have auto iso on. Then the camera will get from 200 to 400 or 800 or 1600 and give you more grainy shots..

Correct exposure for a given scene is the combination of time(shutterspeed) X Aperture (F4 in this case) X iso (sensitivity) X available light (TTL flash not included)If one value comes down, an other has to go up to keep the right exposure..

You want to take the shutterspeed up,something has to give: ie: Aperture not possible since you already are in F4, only thing to do is use flash or raise iso..

But now you are working against the IS. IS is made for longer shutterspeeds to avoid blurry shots, due to camera-shake. Of course, if your subject moves around, you have no choice and have to bring in extra light, meaning mostly the use of a flash or raise iso or both..

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Comment #2

Correction, I should have said I thought I'd use a *slower* shutter speed in conjunction with IS in order to get a better shot in lower light situations. From the responses I've seen so far it doesn't look like my idea has much merit, but I will try it any way and see how it works out..

Jameshttp://www.flickr.com/photos/buddhafinger/..

Comment #3

James Adams wrote:.

I want to get more from my Canon 24-105 f/4L IS lens at lower lightand one idea is to take advantage of the IS more than I have been. Iusually use aperture value mode and this selects a shutter speed forme. Can I compose my shot in aperture value mode, look to see whatshutter speed it chooses, and then switch to manual mode and use thesame aperture setting with a shutter speed 2 or 3 times faster thanwhat it would have chosen for me? Or has the camera already factoredin the IS when it makes the exposure settings in aperture value mode?.

Correction, I should have said I thought I'd use a *slower* shutter speed in >conjunction with IS in order to get a better shot in lower light situations..

If you use the auto metering to get the correct exposure, and then manually override it to set a shutter speed that is significantly slower, you'll just get an overexposed picture because the shutter is open for longer than it needs to be. The presence or absence of IS makes no difference to the exposure, just to whether the shot is blurred due to camera shake (or not)..

If IS allows you to hand-hold with a shutter speed two stops longer than usual, you might get away with 1/8 sec at the 24mm end of your lens and 1/30 sec at the long end, as long as the subject isn't moving, but that depends on your hands and how much coffee you've had recently..

Best wishes.

Mike..

Comment #4

Sure, if you want your picture to come out 2 to 3 stops darker than it should be!.

James Adams wrote:.

Can I compose my shot in aperture value mode, look to see whatshutter speed it chooses, and then switch to manual mode and use thesame aperture setting with a shutter speed 2 or 3 times faster thanwhat it would have chosen for me?..

Comment #5

James Adams wrote:.

I want to get more from my Canon 24-105 f/4L IS lens at lower lightand one idea is to take advantage of the IS more than I have been. Iusually use aperture value mode and this selects a shutter speed forme. Can I compose my shot in aperture value mode, look to see whatshutter speed it chooses, and then switch to manual mode and use thesame aperture setting with a shutter speed 2 or 3 times faster thanwhat it would have chosen for me? Or has the camera already factoredin the IS when it makes the exposure settings in aperture value mode?.

Thanks in advance for your comments and/or suggestions..

Jameshttp://www.flickr.com/photos/buddhafinger/.

Select a smaller aperture, and the camera will use a slower shutter speed. Automatically...

Comment #6

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