Sigma 120-300 f/2.8 AF Adjust

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jms3257 Forum Member • Posts: 54
Sigma 120-300 f/2.8 AF Adjust

Looking for some help adjusting the AF on a Sigma 120-300mm f/2.8 sport, using the Dock and FolCal software. I run through the procedure starting at 120mm at 8” for the first spot on the dock. I get the number of +1. I then enter a +2 in the dock,(all information I have read states that the number needs to be doubled) reset the camera to 0 then run the test again it now wants another +1. I keep doing this and resetting the dock but never get the lens to return a reading of 0 after changing the dock and resetting the camera.

Am I looking at this wrong? Or shouldn’t once you make the correction in the dock, the focus should be spot on.

Thank You for any information

Jim

 jms3257's gear list:jms3257's gear list
Canon EOS 7D Mark II Canon EOS-1D X Mark II Canon EF 400mm f/2.8L IS USM Canon EF 70-200mm F2.8L IS II USM Sigma 120-300mm F2.8 EX DG OS HSM
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