Re: image stabilizer
I think everyone is providing good advice. A couple of things you did not tell us.... are you shooting hand held, and are you doing this as a hobby or for clients?
The reason I asked about hobby or clients, is that many times shooting for a client, even missing that one perfect shot due to an inadvertent shake could be very unfortunate. So, if you are not always steady at hand held, you could leave IS turned on.
I thought you may be interested in some additional information on the Canon IS system, for your particular lens. So, below is an article from Canon ( Technical Report 2001.9 http://www.canon.com/camera-museum/t...09/200109.html)
The EF70-200mm f/2.8L IS USM utilizes the same shift-type image stabilizer system as conventional Canon IS (image stabilizer) lenses, in which the supplementary optical system instantly moves perpendicular to the optical axis to cancel out the camera shake. It offers two image stabilizer modes: mode 1 effective for shooting stationary subjects and mode 2 effective for panning with a moving subject.
3-stop image stabilizing effect (shutter speed conversion)
Previous Canon IS lenses provided improvement in image stabilization equivalent to using a shutter speed two stops faster. The new image stabilizer unit featured in the EF70-200mm f/2.8L IS USM improves the sensitivity of the supplementary optical system and optimizes drive controls to achieve approximately 3-stop image stabilizer improvement (see Fig. 4). This improvement prevents image shake with a probability of better than 90 percent even when shooting at 200mm telephoto and a shutter speed of 1/25 second.
* Fig. 4 Image stabilizer effectiveness of the EF70-200mm f/2.8L IS USM - See attached image.
Automatic tripod detection and malfunction prevention
The EF70-200mm f/2.8L IS USM incorporates the same automatic tripod detection function that is used with Canon’s super-telephoto IS lenses. Output signals from the vibration gyro are analyzed to determine if the lens is hand-held or mounted on a tripod. When the image stabilizer function is turned on and the lens detects that a tripod is in use, the shift lens is electronically centered and locked on the optical axis, preventing improper operation.
Re: image stabilizer
..... one thing never mentioned as well .....
A lot of the ability to shoot a slower shutter speeds also depends on how you hold your camera.
If you hold the camera to your eye with your elbows flipped out like wings (like I see a lot of people do, including some pro-hobbyists and prosumers), you're increasing the likelihood of getting camera shake. Or, if like the casual shooter, you hold your camera "out" from the body and you're using the LCD to line your shots, then you're definitely going to get camera shake.
One way to reduce hand held shake is tucking your elbows in tightly with the body while holding the camera firmly with the lens resting in the hand opposite your control hand, and pretty much bracing the camera against your face.
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