Horshack's Method to Fine Tune Lenses.
I read this entire thread and used the method on my 14-24 and 24-70. My question is what to do about the wide range. The 24-70 2.8 is good from +13 to -20 at 50mm. I have tested each value between numerous times using the OK button at every value. This spread has remained consistent. So is the halfway point between these values the answer? This seems as far afield to me as leaving it off at 0. Any help/comments appreciated. Also is there any variation necessary if one were to shoot a high number of images at infinity.