A friend and I worked on fine tuning our prime lenses yesterday. It was fun and a bit challenging. We were both using Spyder LensCal setups. It was interesting and I think we learned a lot.
One question I have... My 50/1.8g, 85/1.8g, 60/2.8, & 24mm/2.8 all have negative correction values (-8, -8, -14, -20 respectively). I have put these numbers into the stored value, but since they are all negative, should I instead use a negative default, then re-calibrate for that? For instance, could I put in a -10 for the default, then change my values to 2, 2, -4, and -10? How does the "default" value work?
Because all of my lens numbers are negative, I wonder if my D800E body is back-focusing. If that is true, then if I added a default -8 or -10, might that improve my focus for my zoom lenses? (which I did not try to calibrate yet)
Would one of you who knows more about this help me understand, please? Thank you!