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Get information and user reviews for this lens from Amazon: Sigma 80-400mm f/4.5-5.6 EX OS APO RF Telephoto Zoom Lens for Canon SLR Cameras
The Sigma AF 80-400mm f/4.5-5.6 EX OS is an impressive piece of equipment. In terms of build quality Sigma seems to have catched up with the genuine brand offerings. Nonetheless the lens didn’t convince completely. In the lab the sheer quality figures are surely good enough with slightly better MTF results than the Canon EF 100-400mm f/4.5-5.6 USM L IS but in the field the OS didn’t really feel as reassuring or mature (or I had too much coffee at the time …). The rather odd shutter delay issue when shooting several images in a row didn’t help either to lift the impression. It’s interesting that Sigma managed to implement FTM (full-time manual focusing) combined with a conventional AF motor – this is certainly something that we’d like to see in other lenses as well. On the downside the AF is a little on the slow and noisy side. All-in-all the lens should go through a little extra fine-tuning. READ FULL REVIEW
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