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It is clear from the moment we receive the classy packaging that this Irix lens is seriously aiming to compete with the best. Nestled within the unusual tin box lies the widest rectilinear (nearly) lens on the market, an incredible 11mm f/4, suitable for full frame Canon, Nikon and Pentax DSLR cameras. There is a choice of Blackstone and Firefly versions, both optically identical and both weather sealed, and here we try out the lighter Firefly version on a Canon EOS 5DS R body. This should be interesting, so let's look a little more closely at what we have.
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