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.

Handling and Features

A huge plastic snap-on lens hood protects the equally huge, bulbous front element. When in use, this vulnerable front element is protected from impact and from flare by the efficient looking petal lens hood. The hood is fixed and a part of the lens barrel so there is no possibility of using filters. In any event, keeping feet and the photographer’s shadow out of the images is something to watch and a filter mount would almost certainly intrude on the field of view.
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https://www.ephotozine.com/article/irix-11mm-f-4-firefly-review-30678