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Simple auto-focus calibration for DSLRs with adjustable settings.
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<blockquote data-quote="Blade Canyon" data-source="post: 437813" data-attributes="member: 15302"><p>Good question. Reikan says somewhere between 25-50 times the focal length of the lens. That means for a 200mm lens, you would have to be a minimum of 16 feet away. I would say do it at whatever distance you normally use each lens. The important thing is to make sure you are close enough to see the extremely fine focus on whatever target image you use. For my target, I generally put up a book with a busy front cover or a back cover that is covered in small quotations.</p><p></p><p>But you can download Reikan's main target for free, here:</p><p></p><p><a href="http://s449182328.websitehome.co.uk/focal/dl//Docs/Targets/r2/FoCal_Target_5r2ns.pdf" target="_blank">http://s449182328.websitehome.co.uk/focal/dl//Docs/Targets/r2/FoCal_Target_5r2ns.pdf</a></p></blockquote><p></p>
[QUOTE="Blade Canyon, post: 437813, member: 15302"] Good question. Reikan says somewhere between 25-50 times the focal length of the lens. That means for a 200mm lens, you would have to be a minimum of 16 feet away. I would say do it at whatever distance you normally use each lens. The important thing is to make sure you are close enough to see the extremely fine focus on whatever target image you use. For my target, I generally put up a book with a busy front cover or a back cover that is covered in small quotations. But you can download Reikan's main target for free, here: [url]http://s449182328.websitehome.co.uk/focal/dl//Docs/Targets/r2/FoCal_Target_5r2ns.pdf[/url] [/QUOTE]
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Simple auto-focus calibration for DSLRs with adjustable settings.
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