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Strange focus failures and purple fringe with 760D and 50 f1.8 stm

Started Apr 2, 2017 | Discussions thread
Sharlin
Sharlin Contributing Member • Posts: 745
Re: Strange focus failures and purple fringe with 760D and 50 f1.8 stm

Some chromatic aberration (purple fringing) is to be expected with this lens at f/1.8. It should mostly go away by f/2.8. It can also be neutralized pretty well in Lightroom or equivalent. However, the amount in the last photo, even if cropped to 1:1, seems pretty excessive and might indicate a defective lens.

In the Ferrari pic nothing seems to be in focus. It might be that the focus plane is way in front of where it should be - you should do some experiments in a controlled environment to see where exactly the lens focuses. It might front-focus badly, or even have a lens alignment issue such that nothing is sharp.

 Sharlin's gear list:Sharlin's gear list
Canon EOS 80D Canon EF 85mm F1.8 USM Sigma 18-35mm F1.8 DC HSM Art Canon EF 50mm F1.4 USM Sigma 10-20mm F4-5.6 EX DC HSM +3 more
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