Quote Originally Posted by Bill_in_WA View Post
One question I did have came to mind when I read the posting from John relative to doing a calibration with a 1.4X TC attached to his 70/200. I am going to both admit and show my ignorance by asking how, exactly, would the camera AFMA go about identifying a lens with a TC on it and how would it be listed/registered within the index of AFMA lens in the camera?
I have long thought that both my 100-400 and 70/200 have been a bit soft with the TC (and the 100-400 by itself). FoCal may just be woth its weight in gold to a "non-techie" "sort-of techie" like myself. Thanks for any help or suggestions any of you may make.
Bill
The camera knows you have the TC on, as long as it is a Canon TC.
I always thought the same when using the TC with zoom lenses that the TC was to "soft". The 70-200mm II might be close to performing acceptable with the TC on but I have never had a need for it, really I have only found the 1.4x acceptable on the super telephotos and primes. Really it all depends on what you think is "acceptable" and my opinion may not match others.