Sigma 120-300 f/2.8 Sport calibration

ChrisHeathcote

ChrisHeathcote

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Hi a question for anyone with the Sport version of the Sigma 120-300

I have just spent the day carrying out AFMA on my Sigma both with and without TC's. I have been using Reikan Focal Pro to find the optimum settings. My question is how have others carried out the test at Infinity because firstly the target needs to be over 30m away and also even if it was the target would be too small for Focal to pick up.

Also has anyone else had to do any major adjustments or has it just been the odd 1 or 2?
 
The furthest distance I've used was around 15m and that was when I had a 1.4tc on it. I haven't had a problem yet even with objects that are much further away.

I think that without the tc the most it's been out was just a couple of points, but with the tc on it is much worse. I'm using a Canon 1.4 MKI.
 
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Thanks for that, I have got both the small and large charts. I'm starting to think that I'm making a big deal of nothing. In reality when we are looking at distances is the DOF going to be so shallow as to be that noticeablenoticeable
 
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