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<blockquote data-quote="BackdoorArts" data-source="post: 115937" data-attributes="member: 9240">Rick's exactly right.&nbsp; Here's a link on <a href="http://photographylife.com/how-to-calibrate-lenses" target="_blank">Lens Calibration</a> that explains the how to fairly well, and can be followed even if you don't use the tool named in the blog.&nbsp; Within that article they have a link to the <a href="http://michaeltapesdesign.com/lensalign.html" target="_blank">LensAlign</a> tool, and while you can spend money for something like that, the cool part about the link is the Distance Tool tab that will give you an idea of what the depth of field is for a particular camera sensor, focal length and aperture.&nbsp; Set the sensor type (Full Frame or 1.5 Crop for Nikons), your focal length and aperture and look in the righthand panel to see how deep your depth of field is.&nbsp; Change the value in the &quot;Camera to LensAlign Distance&quot; box until you get a DoF that you think will allow you to accurately calibrate your lens (the narrower the better).&nbsp; The smaller the DoF the more accurate you can be.&nbsp; But as Rick mentioned, make sure you're far enough away to allow for the minimum focus distance to be on your target - use single point and make sure it's on that 6 (or whatever number you choose - you're better off with something in the middle of the ruler).</blockquote>

[QUOTE="BackdoorArts, post: 115937, member: 9240"] Rick's exactly right. Here's a link on [URL="http://photographylife.com/how-to-calibrate-lenses"]Lens Calibration[/URL] that explains the how to fairly well, and can be followed even if you don't use the tool named in the blog. Within that article they have a link to the [URL="http://michaeltapesdesign.com/lensalign.html"]LensAlign[/URL] tool, and while you can spend money for something like that, the cool part about the link is the Distance Tool tab that will give you an idea of what the depth of field is for a particular camera sensor, focal length and aperture. Set the sensor type (Full Frame or 1.5 Crop for Nikons), your focal length and aperture and look in the righthand panel to see how deep your depth of field is. Change the value in the "Camera to LensAlign Distance" box until you get a DoF that you think will allow you to accurately calibrate your lens (the narrower the better). The smaller the DoF the more accurate you can be. But as Rick mentioned, make sure you're far enough away to allow for the minimum focus distance to be on your target - use single point and make sure it's on that 6 (or whatever number you choose - you're better off with something in the middle of the ruler). [/QUOTE]

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