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<blockquote data-quote="eurotrash" data-source="post: 109737" data-attributes="member: 9237">Well, what happens is when I calibrate it for f1.4, when I switch my aperture to anything else it seems to shift the focus a few mm front or back. So the calibration isn't completely across the stop range. Also, at night, it seems to lock on to whatever object is brightest, even when my chosen focal point is not the one that comes out being in focus in the picture. No other lens does this for me. It's the only one..GRANTED: this seems to be erratic. Sometimes it will happen, sometimes not. But when it does happen, I know it's not user error. Well, most of the time I can be relatively sure it's not..EDIT: THIS is essentially what he told me to do, but swap the chart for a ruler and the garage door with the floor: <a href="http://photographylife.com/how-to-quickly-test-your-dslr-for-autofocus-issues" target="_blank">http://photographylife.com/how-to-quickly-test-your-dslr-for-autofocus-issues</a></blockquote>

[QUOTE="eurotrash, post: 109737, member: 9237"] Well, what happens is when I calibrate it for f1.4, when I switch my aperture to anything else it seems to shift the focus a few mm front or back. So the calibration isn't completely across the stop range. Also, at night, it seems to lock on to whatever object is brightest, even when my chosen focal point is not the one that comes out being in focus in the picture. No other lens does this for me. It's the only one.. GRANTED: this seems to be erratic. Sometimes it will happen, sometimes not. But when it does happen, I know it's not user error. Well, most of the time I can be relatively sure it's not.. EDIT: THIS is essentially what he told me to do, but swap the chart for a ruler and the garage door with the floor: [url]http://photographylife.com/how-to-quickly-test-your-dslr-for-autofocus-issues[/url] [/QUOTE]

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