We’ve got a pair of Sigma 16mm F1.4 DC DN lenses in the office: one for Micro Four Thirds and the other for Sony E-mount. In this article we have some impressions of the MFT version, as well as some other lenses in this class worth considering.
The 16mm F1.4 acts as a 32mm equivalent lens on the Micro Four Thirds platform. It’s an interesting focal length to end up with: not quite 28mm equiv., which many people would consider the gateway to wide-angle, but also noticeably wider than the near-normal of 35mm equiv. I didn’t expect it to make any difference but found myself constantly fighting against too much stuff creeping into the edges of the frame in a way that I don’t with a 35mm.
In terms of handling, I felt the 16mm worked best when mounted on the larger Micro Four Thirds camera that feature prominent hand grips: its comparatively long length feeling a little unbalanced on the smaller, rangefinder-style boxes, though it’s light enough that it doesn’t end up feeling too front-heavy. The lens’s only control point is a large by-wire focusing ring. It’s a little under-damped for my tastes, rotating fairly freely but it was effective on the few occasions I ended up having to manual focus (turns out LED Christmas lights and autofocus do not always play nicely with one-another).
Optically, I was pretty impressed with the lens, the F1.4 (F2.8 35mm-equivalent) aperture gave me plenty of control over depth-of-field and sufficient light for low-light work. Sharpness seems good if not necessarily stellar and with what appears to be pretty good cross-frame consistency, until you reach the extreme corners. As you’d expect, the performance gets better if you stop down a couple of notches. The 16mm is pretty resistant to flare, even → continue…