Focusing distortion on my Sigma 24-70 at DVinfo.net

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Canon EOS Crop Sensor for HD
APS-C sensor cameras including the 80D, 70D, 7D Mk. II, 7D, EOS M and Rebel models for HD video recording.


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Old January 23rd, 2014, 02:44 PM   #1
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Focusing distortion on my Sigma 24-70

I've been noticing lately that when pulling focus on my Sigma 24-70 lens with my 60D, that elements of the image distort a little bit as I focus. It's hard to explain, but I guess it seems to happen around the edges sort of like barrel distortion. Should I be expecting this from this lens? Is it simply a matter of getting a more expensive lens more suited for video, or is it just the way that type of lens is designed?

I'll see if I can post an example later.
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Old January 24th, 2014, 09:09 AM   #2
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Re: Focusing distortion on my Sigma 24-70

I have never use that lens, but if it's still under warranty I would talk to Sigma and send it in to them. I do see where people have said it does create a bit of vignette.
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Old January 26th, 2014, 07:07 AM   #3
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Re: Focusing distortion on my Sigma 24-70

Yeah, the lenses does breath, or at least mine does, but I don't think it's been noticeable in any of my work.

That's going to be the issue with using photography lenses for video.
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