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I think its much better lens than what people let you think

Started Jan 12, 2014 | User reviews thread
technic Veteran Member • Posts: 8,932
Re: I think its much better lens than what people let you think

Rock and Rollei wrote:

Only had the one 15-85 (thankfully!), but it's been great; as I said, I bought it for the 7D, but it gets a lot of use on my IR cameras (450D/30D, which have different filters).

do you also see corner smearing with the 15-85 in IR, at the wide end of the range? I'm using a 450D with 720nm Lifepixel conversion. First I thought maybe the IR filter was not strong enough and the blur was caused by visible light leakage. But with a front mounted R72 filter the corner sharpness doesn't get much better. The borders/corners are not just 'soft' but with some rough look a bit like motion blur or camera shake; stopping down doesn't help much. At higher focal length it looks much better though, at 85mm it even looks sharper than in visible light

greyscale converted example below (hope this can be viewed at full resolution):

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