Does a Canon body change exposure warnings or shutter speed when using an IS lens?
Asked 7/15/2012
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If I mount a lens with image stabilization on a Canon Rebel XS, will the camera body account for that when showing exposure warnings or choosing settings? For example, if I set f/4 and 1/800 with a non-IS lens and the camera indicates underexposure, would switching to an IS version change that warning automatically? I'm trying to understand whether lens IS affects the camera's exposure calculation, or only how slow a shutter speed I can hand-hold without blur.
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
14y ago
2 Answers
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To correctly expose a photo, you need a balance between shutter speed, aperture and sensitivity (ISO). This is regardless of any IS in the lens or camera. This means that attaching an IS lens will not automatically give you a correct exposure. What you do get is the option of using a slower shutter speed (e.g. 1/200 instead of 1/800) without getting blurring caused by camera movement in the photo, which then might give you a correctly exposed photo.
Most cameras will give you a combination of shutter speed, aperture and ISO to correctly expose the photo if you don't use full manual mode. I don't know if any cameras will use a slower shutter speed instead of higher ISO or larger aperture while using a IS lens.
Originally by user7271. Source · Licensed CC BY-SA 4.0
user7271
14y ago
0
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No. Image stabilization does not change the amount of light reaching the sensor, so it does not change exposure itself. An underexposure warning is based on the exposure triangle: aperture, shutter speed, and ISO.
What IS does is reduce blur from camera shake, letting you hand-hold at slower shutter speeds than you otherwise could. So if 1/800 is underexposed, adding IS does not make 1/800 suddenly correct exposure. Instead, IS may let you use something slower, such as 1/200, and still get a sharp shot if the subject is not moving.
In auto or semi-auto modes, the camera may communicate with the lens, but IS is still not a substitute for exposure. The camera’s exposure calculation remains based on light, not on whether stabilization is available. You should think of IS as helping sharpness at slower shutter speeds, not as changing the exposure warning.
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