armd Offline Upload & Sell: On
|
p.36 #9 · p.36 #9 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes | |
Yes, I've tried a variety of methods including commercial as well as printed B&W targets. All of them are in focus with live view at +10x. I'm wondering if it has something to do with my moving of the targets for the zooms based on the suggested focal length although this wouldn't explain why the 16-35 tuned accurately whereas the 24-105 and 70-200 did not? Perhaps, I should use larger targets as Canon's focus points are in fact larger than what the sensors in the viewfinder indicate. Again, these were all calibrated in good, sunny, afternoon light so that's not the problem. If the lenses were consistently inaccurate in any one direction at least I could address it, but the focus variability after tuning is astounding. I check the lenses against the DSLRkit target afterwards and if I take a series of say 5 photos (turning the image oof each time before AF again) I'll get results like this: slight ff, on, ff, bf, on. Again no discernible pattern.
|