trailguy wrote in post #17896090
OK, I did the head-shoulder shots at 85mm and they turned out good. Nothing special, and lighting turned out somewhat flat, but at least they were not "failures".
There is something very wrong with the second photo. It has a significant amount of motion blur from camera shake and/or subject movement. It looks like it was decently in focus (going by the size and edges of the catchlights), but there is too much blur to say conclusively if it was. This image is only usable as a business headshot if it's going to be shown on the web at no more than about 200 pixels wide. If it's going to be printed or used anywhere larger than about the size of the screen on the back of your camera, I would recommend that you reshoot this employee if you don't have a better shot of her. Likewise for any others that came out like this.
Image stabilization is a wonderful tool, but you should never be taking a portrait of a live human at 1/4 second shutter speed, not with IS, not even with a tripod. People move continuously enough to blur a photo at 1/4. I normally wouldn't shoot even a "still" person at slower than 1/100. Ideally, you'd use your flash in an umbrella for these shots, and a reflector or white wall for fill, not the overheat fluorescents, so that you have enough light to shoot at a decent shutter speed with out having to use too high an ISO. But if you have to jack up the ISO, do it, because a little noise is better than a motion-blurred shot.