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Message: <blockquote data-quote="fmf" data-source="post: 501730" data-attributes="member: 40722"><p>So, after reading all of the calibration hype I decided to give it a go.  First up was my 18-140 and it appeared to have a significant back focus issue.  I adjusted it from -20 to +20 with no adjustment in focus that I could tell.  So I tried my 50mm......same deal.  Now, let me go ahead and say that this wasn't the most precise calibration, as I was shooting at a 45 degree angle to a tape measure..........but I thought that I would be able to see a focus change between adjustments.  I tried every distance from about 14 inches to 10 feet, same thing.  I plan to print out or buy a more precise tool than a tape measure, but wanted to ask for your thoughts in the interim.</p></blockquote><p></p>