Watching Over

by Vian Esterhuizen

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No question — optical. Digital image stabilization in video can mean clever frame-by-frame alignment, but on digital still cameras, it's just code for "cranking up the ISO so that higher shutter speeds are used". In other words, it's marketing BS. Nothing is actually being stabilized, and it doesn't provide anything that you couldn't do yourself with a ...


This addresses speed / focal length aspects only and does not address issues wrt specific lenses. Overlaps with what others have said. As others have noted - antishake / stabilisation only helps to compensate for camera motion - not subject motion. Traditional rule of thumb is minimum shutter speed is 1/s = mm ie 1/50s at 50mm, 1/250s at 250mm etc ...


Image Stabilization (IS). The EF 55-250mm f/4-5.6 IS has it, the EF 75-300mm f/4-5.6 doesn't. IS lets you shoot at a slower shutter speed before camera shake becomes an issue. If you are shooting at shutter speeds fast enough that camera movement is not an issue for you, then IS has very little to no effect on your image. Also, IS will not help you if your ...


Generally, image stabilization is specified as giving a number of "stops" — see What does "N stops" mean when describing an image stabilizer?. For your lens, Canon claims a 4-stop improvement. This means the system can cope with a shutter speed about 2⁴× (that is, 16×) slower. So, if we follow the one over shutter-speed rule, adjusted for sensor ...


There is one rule about the speed and focal length. To avoid camera shake i.e. blurry photos you should use shutter speed = 1/focal length. Let suppose you use 300 mm so your speed should be at least 1/(300*1.6) = 1/480s. For crop cameras you should take in consideration crop factor too (which is 1.6 for Canon crop cameras) With image stabilization you get ...

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