Issues with my Sigma 17-70mm f/2.8-4 DC Macro OS HSM Lens for Nikon
Yeah you need to see if it is back/front focusing. To do the down a dirty method I use my speed square, and mount a printed scale on the 45° edge with a glue stick. Then I set the camera on a tripod, level the camera with the zero mark in the center, and look at the photos. If the zero mark is fuzzy, but one of the other numbers are crisp then it is not focusing correctly.
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