Yes to the glass, Hassey better than Canon. Also at the show with people fighting for the elbow room, one can't move around for the vantage point, so one has to rely on the crops to give you a different look. i.e details of Diesel sneakers, belt, purses.... so the high MP back does allow freedom to crop, but still get the clarity. Only -ve would be M.F.D.B with the mirror slap, they must be shooting with stronger flash like Quantum QFT5d-R. The Hassey's lil pop up won't cut it, unless light is quite bright. What did you observe?