« on: January 07, 2013, 01:05:05 PM »
What camera are you using it with? Some of the cameras have micro focus adjustment which lets you tweak the focus and saves it for that lens and extender combination.
I've got the 7D, but to me it was so far off I didn't think the micro-adjustment would work. I also called CPS and the guy wasn't sure if the microdjustment would remember the lens/extender combo as it's own lens, or if it would remember it as the 70-200 II. I'd say 15 feet off at 90 to 100 feet. I should have tried it on my wife's 5d2 just to test that combo, but I didn't think of it at the time.