Tamron 100-400mm f/4.5-6.3 Di VC USD : qualcuno l'ha provato ? / Parte 2

“ Mode 1 is the standard IS mode and is designed for use with stationary subjects. Not only does IS help deliver a sharper image, but you will also find the Mode 1 stabilized viewfinder extremely helpful for obtaining ideal subject framing while handholding this lens. A stabilized image also aids in auto focus accuracy.

Mode 2 IS is used for panning with a subject. In this mode, only 1 axis of stabilization is provided – allowing a linearly-moving subject to be tracked. Note that people tend to move up and down in addition to forward when running, making successful running people panning shots difficult. Put those people on wheels and you have a much more success-likely scenario. Think bicycles, motorcycles, race cars, etc.

Canon's newest IS mode, previously provided only on super telephoto lenses, is the designed-for-tracking-action Mode 3 IS. In Mode 3, image stabilization is active and ready for use the moment the shutter releases, but actual stabilization is not in effect until that precise time. The view seen through the viewfinder is not stabilized, and you are able to follow your erratically-moving subjects without fighting against image stabilization designed to prevent you from doing the same. IS Mode 3 is designed to detect panning motion and, when detected, will only apply stabilization at right angles to the direction of the detected movement (like IS Mode 2).

Mode 3 IS debuted with the Canon 300mm and 400mm f/2.8L IS II Lenses. I gave Mode 3 a significant amount of workout with those lenses and subsequently made Mode 3 my standard action photography IS mode setting. Off was my previous choice – I usually need a faster-than-minimum hand-holdable shutter speed to stop the action I am shooting. But, I did sometimes see benefits to using IS Mode 3 for action. I welcome this addition to a smaller telephoto lens.

When the shutter release is half-press, IS goes into action. Some clicking is heard when IS starts and again when it stops and in quiet environments, whirring is heard while IS is active on this lens. The IS sounds are not be loud enough to be a problem unless perhaps you are shooting in a dead silent environment, in which case your shutter release may cause much more of an issue. Expect an in-camera mic to pick up IS noise from this lens during video recording.

Note that in Mode 3, IS sound is heard when the shutter release is half-pressed, but the image is not stabilized (including in the viewfinder) until the precise moment that the shot is taken. „