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Archive 2017 · Calibrating Sigma Lenses with USB Dock

  
 
cparker5
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p.1 #1 · p.1 #1 · Calibrating Sigma Lenses with USB Dock


I have the Sigma 120-300mm f2.8 Sport line lens and am trying to calibrate it using the USB Dock.

I get the process of how to do it fairly well, except I am missing one piece of information. What are the 3 distances, other than infinity, I use to calibrate. I know I use the focal distances of 120mm, 150mm, 200mm, and 300mm. Excluding all the debate over what to do at infinity what are the other distances that I set the camera from the target?

Here is the screen to enter the info...







Feb 24, 2017 at 11:17 AM
RZ350
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p.1 #2 · p.1 #2 · Calibrating Sigma Lenses with USB Dock


I would think that the mid point for each range would work, ie, 1m, 6m, 10m or greater and infinity would be ideal. I faced the same quandary with 150-600. I made the assumption that anywhere within the indicated ranges would work. It is nice to have the flexibility, but worrisome that we have to adjust for so many distances. The different focal lengths I understand, the 4 distances, not so much.


Mar 01, 2017 at 12:48 PM





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