New answers tagged canon-600d
I'd go with the constant f/2.8 version. I don't think I've ever used my Canon 17-55/2.8 wide open at less than 55mm, yet have used it wide open @ 55mm a lot, especially for pictures of people (including babies). The IS allows me to use a lower shutter speed at f/2.8 than my 50 f/1.8 wide open, albeit with wider depth of field.
A free tethering solution http://digicamcontrol.com/ which support Nikon and Canon cameras [Disclaimer: I'm the developer]
The Batch Capture feature in Adobe Premiere is for use with Firewire based camera control and video capture. The 600D does not have a firewire connector and thus can not be used with Premiere's batch capture feature. If you wish to do remote capture with your 600D you should connect via USB and use the Eos Utility software that came with your camera.
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