I actually have one of these for sale (I couldnt' post on classifieds, but PM me for the ebay link) ... this lens has created some of my FAVORITE pictures to date . .
One aspect that doesn't get enough love is it ia Macro Focusing with a 180 field of view ... so you can get right up into something, and still the environment surrounding it to give context.
will give a great deal to a fellow Pentaxian here
I'm only selling to help fund a GRiii purchase .. if I carry a big DSLR with me, it's the Z .. so this excellent lens needs a new home
---------- Post added 02-06-22 at 01:33 PM ----------

Taken on a moving subway, through glass over the Manhattan Bridge .. .

Macro focusing (only 3-4" away from the statue nose)

at 17mm the fisheye effect goes away, the SMC coating gives excellent color