The Alpha 350 review screen showed an almost acceptable (but overexposed) result at f/13, but the 7D screen appeared to be overexposed even at f/16 and therefore I didn't even try f/13 - which would have been better for diffraction control. The flash was at minimum power. The Alpha raw file was given -1 exposure in ACR and the Canon file was given -0.6 EV. The Canon 15-85mm seems to be a fair match for the CZ 16-80mm, with better flare resistance but needing slightly higher levels of CA correction setting.