The 90D arrived a little late this afternoon so had time for just a few measurements. It is not very substantial and won't be useful for driving in tent pegs, but it is light. It does provide a good grip for holding telephoto lenses. The download cable is a micro USB and Canon is so mean that it doesn't include one in the box. FoCal isn't ready for for AFMA when tethered to the computer but it does do AFMA on downloaded jpegs. So, I calibrated it it with a 100-400mm II and a 400mm DO II and again with 1.4xTCs. The preliminary data on charts are good. It is outresolving the same lenses on a 5DSR and gives very nice jpegs OOC. More tomorrow.