I wish I could say great things of this lens, because I like it a lot.
But, despite the quite useful focal length that brings a lot of space in your photos, this Pentax lens is not even near to the quality that we are accustomed to in the wide-angle range nowadays.
Not that is a bad lens, but the sharpness is optimal only at the center of the image, no matter how much you close the aperture.
And the borders are, quite frankly, mushy…
All in all a solid performer, but not a great one.
Rating: on film