<p>Hi,<br>
I just bought the sigma art 35mm f1.4 ART to use on D800, and noticed a front focus issue.<br>
I tested it at f1.4 on tripod.</p>
<p><br /> After fine tuning the focus for this lenses to +20, it now looks ok. <br>
The other lenses I have are all nikon and they focus without need to fine tune. <br>
The camera itself was serviced few weeks ago and had the AF system check thoroughly, no issues were found.</p>
<p>I feel unconfortable with fine tuning the lens to this amount, do you find +20 an accetable value or would you return the lens insetad?</p>
<p>Thanks</p>
<p>Regards,</p>
<p>Francesco</p>