The IRIX 15mm f2.4 FireFly has lots of the benefits of its bigger brother with very few drawbacks.
Earlier on, we reviewed the IRIX 15mm f2.4 BlackStone, which is considered to be the higher end option to the IRIX 15mm f2.4 FireFly. That lens was great, and in our findings we recently found the IRIX 15mm f2.4 FireFly to be pretty much just as great. Both lenses have weather sealing, both are manual focus, both can lock their focus and they have innovative features compared to many other options on the market. Of course, they both have fantastic optics. The major advantage of the Blackstone? A metal body, slightly better image quality (though noticeable), and a special, black light-illuminated material in the ink on the lens. But if you don’t care for any of that, the IRIX 15mm f2.4 FireFly survived with us through rainstorms.