Should I see, feel or hear anything different when I use my lens ? Many thanks in advance !
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You should hear/feel a faint sound after the shutter button is half-way depressed, and another one about a second after you let go of the shutter button.
As far as images are concerned, you're only going to see differences in cases when the IS actually serves a purpose. For the 135mm end of the zoom, you should see benefits slightly when the shutter speed is about 1/200, and quite distictly when the shutter speed gets slower than 1/100, down to around about 1/25, where they will be much sharper with than without the IS. If you're shooting in sunlight, and/or at high ISOs, it is much less likely that it will make a difference, as the shutter speed may already be 1/200 or faster. Also, IS works best after it has been engaged for a fraction of a second; pressing the shutter button all at once to take a picture will not reap the benefits of IS as well. If you're not already doing so, get in the habit of having the shutter half-pressed while composing your image; it will use more battery, but the camera will always be more ready (and you shake the camera less taking the exposure when the shutter is already half-pressed).
