Microadjust question

[Chris Brennan]

I recently bought a refurbished Mk3, and for the most part, the camera has performed just like it's supposed to. I use it primarily with a 100-400, and the shots I take with that lens are sharp and crisp. My other body is a 40D and the 100-400 performs equally as well. My primary "long distance" lens is a 300mm f2.8L IS, 99% of the time with either a Canon 1.4x TC or a Canon 2x TC. With the 40D, the lens is incredible! Very sharp images across the board, regardless of with or without TCs. On the other hand, the 300 with the Mk3 is less so, and some shots I made yesterday with the Mk3 and 300+2x were clearly disappointing. I figured I'd use the microadjust feature in the Mk3 to fine-tune the 300 to the camera but want to know if that adjustment should be with or without TCs... my guess is that the adjustment should be made without... Can anyone weigh in on this?

[Axel Hildebrandt]

You should run the microadjustment with the bare lens, then with 1.4x and 2x TC. The camera recognizes if and what TC is attached and will go to the microadjustment setting for the right one.

[Chris Brennan]

Thanks for the info! I had a feeling that the camera would recongize the TCs but wasn't sure...

[Cal Walters]

Does anyone know if the camera will recognize which lens the TC is attached to? If you have 2 lenses you could use the TC with, does it distinguish between them in combination with the TC or just recognize the TC?

[Marc Mol]

Hi Cal
With the Nikon system AF fine tune will recognize most lenses (all Nikkor's) and distinguish whether they have a TC on or not.

[Chris Brennan]

Does anyone know if the camera will recognize which lens the TC is attached to? If you have 2 lenses you could use the TC with, does it distinguish between them in combination with the TC or just recognize the TC?

Carl -

Yes, the 1D Mk3 does recognize the lens and TCs; for instance, when I put the 1.4x on the 300, the display indicates "EF 300 f2.8 IS + 1.4x". It does the same with the 2x as well. Someone should correct me if I'm mistaken but you can only save 20 settings in the camera so if you've set 6 lenses with both 1.4x and 2x TCs, as well as the native lens, you've used up 18 of the 20 saved settings.