Thanks Eugene for the info on the TSE and the 16-35. The shutter vibration issue is a little concerning.
When I got my 55 yesterday I was finding shots were not sharp at around 1/80th. I assumed this was due to not having my shutter speed fast enough for the movement of my son (although I had thought anything above 1/50th should be fine)
I will have to do some tests of my own and see. Is the issue only when tripod mounted or any shots around the 1/100th mark?
you need at least 1/100. The 1/FL rule doesnt apply with high megapixel cameras. I'de side with 1/125 at minimum (1/2FL is a bare minimum for handheld with the exception of stabilized lenses).
I do have a few tripod mounted shots @50mm and 1/100, and no issues (indoors calm environment).
another minor detail, I have the L bracket mounted to BODY, not adapter like some folks have it.