I taped an Imatest SFRPlus target to a mirror, and shot it straight on with the a7R and the Zeiss 55mm f.1.4 Apo Distagon at f/5.6, f/8, and f/11. ISO 100. Thanks to an ND filter, exposure times were 4, 8, and 16 seconds. Then I moved far enough to the side so that I… [Read More]