The NEX 7 has forced me to use Cornerfix on the Heliar 15, ZM25, and Summicron 35 ASPH. The Cornerfix blanks below were at infinity, white diffuser over the lens and +2 EV at a white poster board in the shade. All were stopped down 1 stop from wide open. I think I did the blanks right, but I would like them to be close to white in the center frame in order for cornerfix to not alter the center at all.
The ZM25 appears to have an extremely flat field. The 35/2.0 has a mild amount of field curvature, but I\'m still investigating that.
