Lightnings taking a ride

by ceinmart

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For an f/2.8 lens, it is not really necessary. f/2.8 is a fast lens and you can use higher shutter speeds. For an f/4 lens, it might be useful in some situations. An f/4 lens is a medium speed lens and can require shutter speeds slower than desired. This is why Canon has IS on their f/4 lenses and not on their f/2.8 lenses ("L" Series).


There is a technical reason for not incorporating image stabilisation in a typical high speed Gauss type lens. Optical IS requires a moving lens component that displaces the image laterally without defocusing. This can be done in most multi-component asymmetric constructions, by moving some component controlled by a stabilising sensor. However the heavier ...

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