Nobody's saying that the lens is altered or that the shake as recorded on the sensor is any greater in an APS-C sensor than it is in a FF sensor. But the result of the 1.6x greater magnification needed to get a nominal print magnifies the shake by 1.6x as well. End result, like everyone's saying, you need to multiply your FF safe shutter speed by 1.6 to get a ballpark figure for the APS-C safe shutter speed.
http://photography-on-the.net/forum/...4&postcount=16
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