may i ask how did you figure out the adjustment necessary? Did you use:
1. 45 degree angle chart
or
2. Trial error on + & - compensation in micro-adjust?
The problem with micro-adjust is that lens are not uniform across the whole focal length. My lens is perfect with +5 adjust when zoom at 55mm, but the same lens screw up the 17-35mm range after +5.
If I am not wrong, I remember the canon tech saying when they do focusing adjustment, they have to consider the entire focal range the lens has.
Thanks
Ha ha. Below is my own method of adjusting my lenses, other people might have better way to do it.
1)For fix focal lens like my Sigma 50 F1.4, I'll mount the camera on tripod. Set AV mode wide open, large Jpeg, Picture Style switch to Neutral, set Drive Mode to 2sec Self-timer, switch on Liveview, manual focus. Focus on static object distant around 1m, take photo.
Turn the focusing ring to infinity, engage the AF switch, switch off Liveview, set AF to One Shot AF, set AF point as Spot AF at the center AF point, set mirror lockup, depress shuttle button to take another photo.
Playback and compare these 2 photos sharpness on AF targeted spot. If they are tally, no adjustment needed, if not, keep adjust until they are equal or close to equal.
Try the same way to far distance object(distance scale close to infinity) and compare sharpness on AF targeted spot on those pictures. Repeat the process until getting the most acceptable result.
2)For all my zoom lenses, I will use the same method to adjust on the wide end(close & infinity focusing) and long end(close & infinity focusing).
Am not using angle chart so far.
