Ok, so, this is where I find myself out of my league, I really didn't understand any of that... I checkend the lenses I have and the 15-55 has 3.5 to 5.6 F, while the 75-300 has 4 to 5.6 F... Would that be a problem? If I understood correctly, this is bad for low light conditions, which are really not something I expect to be shooting day in and day out, so I'm not sure if it could be a problem. Also, I understand noisy, but as you mention later on, this is possibly only going to appear on web and on tv, so, to the untrained eye, depending on the noise level, it might not be an issue. The shallow depth of field could absolutely be a problem, and I already plan to buy an external monitor, but then again, so far, I have been pulling focus on a 3" monitor, so it's not really a difference, I mean, since I still have a lot of stuff to learn, I think I can be flexible enough, but being a bit unexperienced, maybe I don't really understand the limitations. Then again there are other things to consider. Weight and ease with which a camera can be carried are very appealing, I wouldn't dream of randomly going out with a video camera, whereas the simple camera is easier to carry... You had the experience of shooting a commercial with the 7d... how was it?