« on: April 10, 2014, 11:18:49 AM »
If you look here:
it looks like this lens is sharpest around 5.6. I wouldn't go above F8 unless you really needed the additional DOF.
My 135L is sharpest at F5.0 as per Focal Pro. Is your lens AFMA'd to the body?
For fun you could always try walking up the sync speed too - it is a function of the camera max sync which was talked about earlier along with the trigger max sync. The worst thing that can happen is you will start to see the banding of the shutter creep into the shot - from there back it off a 1/3 of a stop or so.