I have decided to get a full frame body. I have been building up my lenses to do this. The two main lenses I use are the 24-70 and a 70- 200 2.8 is. I have done a few weddings and the 24-70 was on my camera 80% of the time. But it has suddenly hit me that I will be losing the long end of my 24- 70, and might end up with me losing time changing to my 70-200 for portrait shoots. The 70-200 is quite a heavy lump to keep changing in an environment where speed is essential, or to have it hanging around you on another body just for those portrait shots, I only brought the 70-200 out when I knew I would need it. I know that 85-135 mm is the ideal length for head and shoulders shots, but I also know that a 24-70 is the main lens used by wedding photographers, and portraits are done quite a lot in a wedding. So I was wondering has any one used a 24-70 for head and shoulders shots, is it ok to use now and again so you don't have to keep swapping equipment. I did think about using the lens at 70mm but not to get to close to the subject, so I get more of the body in the shot and maybe this wouldn't distort the features and crop it latter. Does anyone think this will work ? Thanks.