crewchief227
Senior Member
I wanted to do a quick test of my new Tamron and since I have never done a calibration before I don't want to screw it up without asking first. I know I probably should use a darker book, and I know I blew out the book but I wasn't concerned with perfect exposure. The ruler is at a 45 (or as close to a 45 by my eye) and the book is horizontal to the 6 inch mark. So do I need to go back or forth, it looks pretty close to me and on the camera is back negative numbers and forward positive numbers?