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Calibrating Autofocus on Sigma 150-600 Contemporary
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<blockquote data-quote="GracieAllen" data-source="post: 671273" data-attributes="member: 41283"><p>I did some testing the other evening. Using the dock, I set up a target at 48 feet and shot images at 400mm at +20 +15 +10 +5 = -5 -10 -15 -20. Then did the same thing at 600 mm....... Then found a fairly detailed subject that was DEFINITELY at infinity and did the same thing at 600mm.</p><p></p><p>I finally decided if the lens was off at either focal length, it's not enough for me to see an OBVIOUS problem. I'll have to try again on a really bright day 'cause it was somewhat overcast, which I think makes it more difficult to see small imperfections...</p><p></p><p>One thing I DID find was that the 150-600 jumps WAY past infinity VERY quickly. It looks like anytime it can't find a subject it likes, it goes way past infinity... I haven't tried it, but I had a thought about that - if you took one of the custom settings and went into focus range and move the furthest back ONE notch so in theory the lens would NEVER QUITE get to infinity, would that keep it from doing anything stupid when it loses the subject against a bland sky...</p></blockquote><p></p>
[QUOTE="GracieAllen, post: 671273, member: 41283"] I did some testing the other evening. Using the dock, I set up a target at 48 feet and shot images at 400mm at +20 +15 +10 +5 = -5 -10 -15 -20. Then did the same thing at 600 mm....... Then found a fairly detailed subject that was DEFINITELY at infinity and did the same thing at 600mm. I finally decided if the lens was off at either focal length, it's not enough for me to see an OBVIOUS problem. I'll have to try again on a really bright day 'cause it was somewhat overcast, which I think makes it more difficult to see small imperfections... One thing I DID find was that the 150-600 jumps WAY past infinity VERY quickly. It looks like anytime it can't find a subject it likes, it goes way past infinity... I haven't tried it, but I had a thought about that - if you took one of the custom settings and went into focus range and move the furthest back ONE notch so in theory the lens would NEVER QUITE get to infinity, would that keep it from doing anything stupid when it loses the subject against a bland sky... [/QUOTE]
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Calibrating Autofocus on Sigma 150-600 Contemporary
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