Questions regarding Nikon 105mm/Sigma 180mm Micros

Started Feb 18, 2014 | Discussions thread
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billslatteryjr
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Questions regarding Nikon 105mm/Sigma 180mm Micros
Feb 18, 2014

To get the same size image, how much of a difference is there in working distance between these 2 lenses on a D800? I see the Sigma has a min focus distance of 38.10cm the Nikon has a 30.48cm Not much of a difference to get to 1x magnification. That makes it seem like the Sigma only gets you a 26 % gain in distance. Or doesn't it work that way?

It takes only a small movement on my Nikon 105mm's focus ring to move the center of the focus point. Does the Sigma take more turning to change the focus? Is there a term for this?

Thank you.

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