A few days ago, I downloaded FoCals latest update, 2.3. It includes the 5D Mark IV. So far I've done about half of my "L" quality glass using the program. Each lens was calibrated, and was very easy to accomplish. The 5DIV is my first camera with a touch screen, now I'm hooked. I breezed through FoCal, and all the adjustments the program asked for. FoCal does a very good job on zooms, it gives the best value, and sets the camera up automatically after asking for full positive, and negative adjustments, then asks for mid points both positive and negative. Using the program, I suggest a very stable tripod, and be sure the camera is at the same level as the target, be sure the target is well lite.
B