I would like to shoot black and white images using my 600D / Rebel T3i. I would like the LCD to display a black and white image, but I would like to capture the image as a full-colour RAW file.
Is this possible?
Just set a black and white picture style but keep the file type set to raw. See this post for more information: Do different "Picture styles" affect RAW output?
The canon EOS 600D has an option, in the AV mode, to change the camera from colour to black and white (I.E monochrome). This will also allow you to enable it for shooting in RAW, JPEGs, or both at the same time.