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15-85mm Lens Blur

Started Feb 1, 2016 | Discussions thread
role_of_72 Junior Member • Posts: 32
Re: 15-85mm Lens Blur

Hi and welcome on dpr forums!

I'm no expert but as I looked through your pictures there is clearly a difference between the left (better) and right sides of the frame.

I would not attribute it to the UV filter you have. I have the same filter on my Sigma 10-20 (although a 77mm Japan made one) and it can cause some flare in contra-light situations and with street lights at night but this blur is not because of that.

The houses/trees on the left and right sides are approximately in the same distance so it is not a DOF issue. I would also like to mention that these pictures does not even show the wide open performance! If I were you I'd try it wide open, too, because stopping down to F9 of F10 (like you did) can even hide a part of the problem.

By the way my Canon 18-135mm stm has a bit of this problem, too, but I noticed it only on a few shots and notat all focal lengts. The thing I can advise you is to go out with your tripod and do an extensive test wide open at all the marked focal lenghts (lens IS off, 2sec timer, mirror lockup, etc... you know ).

Then examine the results and decide whether it worths a repair or not (repair cost, warranty?). For example my lens is adequately sharp on the blurrier side even on 40x60cm prints so I decided to use it the way it is. But it differs from case to case.

Have good luck with it!

 role_of_72's gear list:role_of_72's gear list
Canon EOS Rebel T4i Canon EOS M5 Canon EF 50mm F1.8 II Sigma 10-20mm F4-5.6 EX DC HSM Samyang 8mm F2.8 UMC Fisheye +4 more
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