As said before, the 135 degrees view of the Laowa 9mm f/5.6 is difficult to handle. OK, once in a while I would use the entire field of view, just to show how enormous it is. I think it will be more regular for me at least to either shoot the lens on the Z fc/Z30, or put the Z9 to DX mode.
However, I just *had* to investigate whether the 9mm could do IR. There is no filter thread in front thanks to the bulbous front element, but room for a rear slim filter mounted in an ad-hoc fashion. I searched for, and found, some IR gel filters that I cut to size, for a first try.
It works (full-spectrum Z5). No hot spot, which is unusual for new optical designs on the mirrorless systems. The field of view is of course unmanageably wide. Sharpness is surprisingly good even in IR, however some smearing to the corners is caused by astigmatism.
