Here’s a few shots of my recently acquired Irix 11mm/f4.0 on my full frame Pentax K-1. I use a Lensfun profile in DT converted from the LCP profile offered by Irix on their website, I post process a bit, mainly levels & curves in Digikam/Showfoto and on the ISO6400 shots I applied some NR in NeatImage. Original ooc jpegs below the converted ones.
Final
OOC jpeg







