When is Image Stabilizer more important to have?
Is it something that pays off when you take action shots? Or, is it as helpful when taking landscape photos?
IS can help when you need to take a relatively long exposure time which is not normally achievable hand-held.
The rough rule that people use is to try and not use a shutter speed longer than the focal length you’re shooting at. For example. Shooting with a 200mm telephoto lens, most people can hold it no longer than 1/200s to take a steady exposure. Depending on the version of lens, the same person may be able to take the same shot with a shutter speed as long as 1/25s with assistance of IS which is particularly handy in low light environments such as indoors when flash photography is not possible.
Some lens which are geared up to sports photography (such as the Canon EF 70-200mm f/2.8 IS) even have a second IS setting allowing you to pan horizontally whilst smoothing your vertical movement.
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