This is an in-depth field review of the ultra-wide full-frame Irix 11mm f/4 lens released in 2017. I have tested the more expensive and heavier Blackstone version, but since the Firefly version features an identical optical design, all conclusion made in the review hold for both versions. This glass is the widest rectilinear lens for full frame cameras. Only the Canon 11-24mm f/4L gets equally wide. Shooting with such an extremely wide lens brings a whole lot of practical challenges as well as creative opportunities. And that is exactly what this review is going to focus on.
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