Sigma 85 1.4 DG with 7d, is it a bad copy?

[bhavesh]

<p>100% crop of above picture</p><div></div>

[bhavesh]

<p>one more example, picture 4, 1.4, 1/4000, iso 500</p><div></div>

[bhavesh]

<p>100% crop of picture 4</p><div></div>

[ilya_e]

<p>Were the other 6 images sharp? Can you post an example? The lens is very sharp at 1.4 but don't forget that at 1.4 DOF is very shallow so it's easy to miss.</p>

[bhavesh]

<p>@ Ilya,<br>

1) the images that i just posted earlier are sharp enough at 1.4?<br>

I'm confused, is this result due to my inability to shoot correctly at shallow depth of field or my lens is not upto the mark?<br>

here is the sharpest image @ 1.4</p>

<div></div>

[bhavesh]

<p>100% crop of the sharpest picture</p><div></div>

[ilya_e]

<p>If this is your sharpest photo then I suspect there is a problem with the lens. Do you have any other bodies to try it on? You could probably use microadjustment feature of the 7D to see if it will cure the problem but in any case I would try to exchange it. 100% crop of one of the test images I made with it at 1.4. As you can see it's tack sharp.</p><div></div>

[jim_ducey]

<p>Try taking photo using the AV setting, you should have only one focal point, that close to the subject you depth of field is only a centameter or two at most.<br>

<a href="http://www.dofmaster.com/dofjs.html">http://www.dofmaster.com/dofjs.html</a><br>

Jim</p>

[oofoto]

<p>My first ever lens was a Sigma 28-90 or something like that with a Canon film body Eos 300 I think. For 2 years of my daughters life most of the shots are OOF and I thought it was just me. Then I found PN and asked what lens to buy -> 50mm 1.4 -> amazing in focus photos.<br>

I'd never touch another Sigma.<br>

A little off subject but hey ho.</p>