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Calibrating Autofocus on Sigma 150-600 Contemporary
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<blockquote data-quote="Fred Kingston" data-source="post: 670878" data-attributes="member: 10742"><p>Focal does a series of adjustments using Nikon's Fine-tune adjustments... It tethers to your computer, it has a couple of calculators that analyze the Target for distance and exposure... From that point forward, it does its own analysis without you trying to determine whether it's front or back focusing... and creates a series of data points that your camera's fine tune setting needs to be for a specific focal length... After you've tested a particular lens at different focal lengths, and IF there's a difference in Fine tune adjustment, you can either elect to use an average of that data, or if it's significant enough, you might want to consider that when shooting at those lengths... </p><p></p><p>Focal certainly eliminates trying to determine small visual differences between dozens of images...</p><p></p><p>I don't have a clue what Sigma's dock/adjustment does...</p></blockquote><p></p>
[QUOTE="Fred Kingston, post: 670878, member: 10742"] Focal does a series of adjustments using Nikon's Fine-tune adjustments... It tethers to your computer, it has a couple of calculators that analyze the Target for distance and exposure... From that point forward, it does its own analysis without you trying to determine whether it's front or back focusing... and creates a series of data points that your camera's fine tune setting needs to be for a specific focal length... After you've tested a particular lens at different focal lengths, and IF there's a difference in Fine tune adjustment, you can either elect to use an average of that data, or if it's significant enough, you might want to consider that when shooting at those lengths... Focal certainly eliminates trying to determine small visual differences between dozens of images... I don't have a clue what Sigma's dock/adjustment does... [/QUOTE]
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Calibrating Autofocus on Sigma 150-600 Contemporary
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