I've tested the shake reduction with 50mm, 18-55mm, 80-200mm and 80-200mm with a 2x converter (that's 200x2x1.5 = 600mm equiv. on a film slr). My Minolta has anti-shake with a 12x zoom so I had something to compare against. For older K mount lenses the camera asks you to confirm the focal length when you switch on. Shake reduction is definitely worth having, I have taken shots at ¼ of a second and got a usable picture. Obviously, your shutter speed needs to match your subject but with people for example you can easily take shots indoors without flash (auto white balance doesn't cope that well with indoor lighting, make sure you switch it over in the function menu). I also tested the 200mm zoom with 2x converter taking a picture of a tree in the distance at 1/60th handheld. This picture is really sharp even blown up quite a lot. In conclusion, it seems to be as effective as the Minolta. The big plus is that the shake reduction uses a floating sensor in the camera body; it works with any lens, even my old manual focus ones. You don't get that with Nikon and Canon.