First Looks at Irix 11mm f/4 Firefly/Blackstone Lens Image Quality

Image quality results from the Canon EOS 5Ds R, Canon EOS 7D Mark II and Canon EOS-1Ds Mark III have been added to the Irix 11mm f/4 Firefly Lens Review.
 
Important Note: You will see the mid and periphery sharpness of the test chart fluctuate unusually at certain apertures. For example, this lens shows as being peripherally sharper at f/4 than f/4.5. We tested the lens on the ISO 12233 chart a second time to be positive the results were repeatable and ... they were. To frame even a large test chart at 11mm requires a rather short focus distance and I am not seeing this issue in longer focus distance testing (I'll share these results in a full review soon). Overall, I'm really liking this lens.

Here are some comparisons that you might be interested in:

Irix 11mm f/4 vs. Canon 11-24mm f/4L Lens
Irix 11mm f/4 vs. Sigma 12-24mm f/4 Art Lens
Irix 11mm f/4 vs. Venus Optics Laowa 12mm f/2.8 Lens

Note that the Firefly and Blackstone variants of the Irix 11mm f/4 share the same optics. I'll list the full set of differences in the review, but the Firefly is lighter and less expensive while Blackstone is better-built. Both are bargains.

These lenses are a great deal at regular price, but through today, there is a $50 instant savings on the Firefly and $100 instant savings on the Blackstone at B&H.

The Irix 11mm f/4 Firefly/Blackstone Lens is in stock at B&H | Amazon | Adorama