Originally posted by Patajac Have in mind that you have adjusted only for one focal length.
After multiple testing procedures, my Tamron 17-50 was perfect at 50mm with -5 adjustment but needed +8 at 17mm so if I adjusted at 50mm with -5 it was +13 off at 17mm.
It is now in for service and calibration.
Seems there are lots of focusing issues with this lens.
Actually, I did it at a few different focal lengths, as there were different sized paintings. Mind you, they were probably all between 35mm and 50mm. Nothing on the short end. It is a good point, and I do agree about there being focusing issues generally with this lens. I think it's one of the more problematic lenses I've seen reported. Now I'm going to have to set it up again and try it at the wide end. Thanks. (not sure if that's a good thanks or sarcastic thanks.)
Also as a note, I've got it at -5 as well.