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Nikon DSLR Cameras
D7100
D7100 Inconsistent autofocus. Backfocus / front-focus
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<blockquote data-quote="Fred Kingston" data-source="post: 661416" data-attributes="member: 10742"><p>By using a diagonal ruler and focusing on the mid-point... you can take test pictures and by looking at the in-focus and out-of-focus tick marks, you can determine whether that particular lens is front-focusing or back-focusing... There are dozens of YouTube videos that walk you thru this process... as well as commercial companies that sell/license various focusing systems/targets for the Nikon fine-tuning system.</p><p></p><p>There's a database in your camera to store the adjustments. Every lens needs to be tested and adjusted... the database in the camera keeps track of the adjustments for each lens and adjustment.</p><p></p><p>You can test/adjust the lens at the F1.8 but in actual use, just understand that most lenses are "soft" wide-open... It's just a fact of optics... unless you get into the really expensive art prime lenses...</p><p></p><p>You need to set up a ruler and target... taking pictures of your friend is not precise enough...</p></blockquote><p></p>
[QUOTE="Fred Kingston, post: 661416, member: 10742"] By using a diagonal ruler and focusing on the mid-point... you can take test pictures and by looking at the in-focus and out-of-focus tick marks, you can determine whether that particular lens is front-focusing or back-focusing... There are dozens of YouTube videos that walk you thru this process... as well as commercial companies that sell/license various focusing systems/targets for the Nikon fine-tuning system. There's a database in your camera to store the adjustments. Every lens needs to be tested and adjusted... the database in the camera keeps track of the adjustments for each lens and adjustment. You can test/adjust the lens at the F1.8 but in actual use, just understand that most lenses are "soft" wide-open... It's just a fact of optics... unless you get into the really expensive art prime lenses... You need to set up a ruler and target... taking pictures of your friend is not precise enough... [/QUOTE]
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Nikon DSLR Cameras
D7100
D7100 Inconsistent autofocus. Backfocus / front-focus
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