travisdeland Loc: deland, FL

I've now acquired 3 of Sigma's Global Vision series lenses, and so acquired a USB dock. I realize that these adjustments will only be accurate for 1 camera body-I have a Canon 70D and a 7D2. I've used the AFMA on both cameras, and am happy with the results, but look forward to some more exacting fine-tuning. My question is this: Should I set the AFMA back to zero on the first camera, before I use the SOP process? Seems like the correct way to go, but the instructional details are lacking in this area-even with the videos and blogs. I realize that the second camera will have to be re-checked/adjusted. Thanks for any insight.

LFingar Loc: Claverack, NY

You might want to PM Hog member MTShooter. He is experienced with the Sigma dock and you can rely on his advice.

travisdeland Loc: deland, FL

Thanks-I'll give it a bit, to see if he does respond, and do that. I feel that I understand the process, but would like some verification.

MT Shooter Loc: Montana

The Sigma USB Dock actually tunes the LENS regardless of what body it is on. Reset your camera's tuning to "0" before tuning your lenses. Some of the Sigma lenses have the ability to set two different tunes, handy if you use it on two different bodies

travisdeland Loc: deland, FL

Thanks, MT-thought that was the way to go. Didn't realize that some lenses could "dual tune"-hopefully one or two of mine can-Have the 150-600C, 17-70C, and 18-300C

Mark7829 Loc: Calfornia

Just talk to the manufacturer. Why come here and get indirect and likely bad advice?

thelazya Loc: Wendell, MN

I'll take the advice here over any company rep anytime, just have to sort through the ones who read the entire message and answer with authority.

travisdeland Loc: deland, FL

Didn't realize MT_Shooter's advise was indirect, and likely bad-he was exactly the one I was hoping for a response, from, since he knows his s**t.

BigGWells Loc: Olympia, WA

wow, who peed in your oatmeal.

Mark7829 Loc: Calfornia

As many times as people come in here and ask a product question the most accurate is going to come from the manufacturer. Who would disagree with that? What I find with this site with few exception is a plethora of personal advice but not authoritative. Since almost everyone is a beginner, the likelihood with exception is getting incomplete, or simply bad answers.

So many questions could be answered with just a simple call or email directly to the manufacturer, or does everyone think this is always the first place and only place to get information? Or are we just that lazy? You can always get information, good information is rare. in fact, when people don't have an answer, instead if just not answering, they will actually take the time to type, "I can't help you" or "I don't know".

Just yesterday, someone said that he took a picture in his bedroom of his TV screen and claimed the lens that was discussed was very sharp. It was a Sigma or Tamron 150-600. How on earth can that be authoritative?

Just saying ....

LFingar Loc: Claverack, NY

You can't always count on the factory reps. I had a John Deere rep try to tell me that an engine warranty would be void if I didn't use John Deere oil. Totally false, but he insisted on it because he didn't know his job. Not all factory sources are created equal.

joer Loc: Colorado/Illinois

More often than not factory reps are sales people rather than techs. We all know what sales is about.

George II Loc: Fayetteville, Georgia

:thumbup: :thumbup: :thumbup: :thumbup: :thumbup: :thumbup: :thumbup: :thumbup:

George II Loc: Fayetteville, Georgia

That is quite true but does that mean all factory reps are ill informed? I think not. I did have something happen along the same lines and my response was to ask him where that was written in the paperwork. I got the Duh response to which I requested his supervisor...problem solved..
Just sayin, the "G"