As the weather is not very inviting to go out and take better shots than yesterday after I bought that lens, I thought I could share some details which were new, at least for me. Not much test reports available at the moment as well. But both Irix-lenses (or all 4, as the two focal lengths are available each in two versions, firefly (less expensive) and blackstone (more metal on it).
But the following is not about the optical quality. That could be much worse, but at a price point of 900.- for an ultra-wide (not to use the term "hyper wide" for FF sensors obviously the quality has some space to improve. More on that later.
After pulling the lens out of its soft shell case, which sits in a tin-box which sits in a card-box (you get a lot of unboxing-show for that money... ) I discovered a second rear-cap. Maybe necessary? Mots of that cap is of comical shape, so it could slip out the fingers. Put that off and see a metal mount with rubber gasket (the blackstone version has better weather sealing than the firefly-version, I think) and the filter holder for 30×30 gelatine filters. And the electrical contacts. Aperture is set by camera (but mechanically, like the non-E Nikkors), the lens delivers EXIF like focal length and aperture value - well made, Irix! Not just a manual lens like Laowa.
The dealer had the gelatine filters. A little plastic bag, containing 5× ND4, 5× ND8, 5× ND16, cost me 18.- francs extra, more on them also a bit later.
Focus-ring is well damped, has a DoF scale and also a hyperlocal scale - both I don't trust with a + 40 MP camera. These scales are, opposite of what Irix claims, not phosphorescent. They don't save light to glow in the dark, but you can see them much better than most AF scales.
The ∞-position clicks in, you can feel it. If one decides to go hyperfocal, you can lock that position. And the lock is solid, although I would recommend to hold the lens on it's fixed diameter if you want to unmount it to put in a gelatine filter and remount it again.
Now we're coming to the frontside. After removing the most clever designed lens cap I have seen on ultra-wide angles, the bulbous front element is exposed. And protected by a plastic lens hood which I cannot remove. That hood shows a little screw which holds a cover. After removal I could adjust ∞-position, or better said the click-position of it. There's an extended manual available for this operation. The manual itself is well done and comes on 11 languages.
Back to the clever cap. Two buttons at it's side release two plastic hooks which hold it in place. How often I pulled an ultra wide lens out of the bag and the front cover was already off because it stuck in the bag - no longer with this design .
Gelatine filters, some thoughts about