Originally posted by jimr-pdx It is getting messier now that Samyang makes short-register ultrawides too. One must read carefully to be sure, now more than ever! Their 12mm f2 for example is not for K cameras.
Yep, I think this is the problem.
If you buy Samayang it has to be "for Pentax K-mount", not Q, not Nikon, Canon, m43.. unless you want a lens for one of those other mounts/cameras.
The Samyang 14mm f2.8 is not a fisheye, it is just ultra wide. The Samyang 8mm is a fisheye. The 14mm still has distortion and so on, as do all ultra wides, but it is rectilinear, which means straight lines. You might also want to think about the Samyang 16mm f2.0.
Also, Samyang lenses are sold under names like Rokinon, Bower, Walimex, ProOptic, Falcon, etc.