$120 · Pentax SMC 28mm 3.5

Early pentax wide angle lens. "The Pentax SMC K 3.5/28 doesn’t have any real weakness. It delivers surprisingly good performance in a small package." "What surprised me the most was the truly exceptional flare resistances and very high contrast. I didn’t know that a 40 years old lens could be that flare resistant. The Pentax is even better than the Zeiss Distagon 2.8/28 in this regard." https://phillipreeve.net/blog/review-pentax-k-smc-28mm-13-5/ " From first hand experience with the lens, it appears likely that the lens was optimized for landscape use. Lenses of that vintage often suffered a loss of sharpness toward the corners. Resolution tests, however, demonstrate that the K 28/3.5 as one of the sharpest lens, corner to corner, that Pentax had produced up to that time. It is likely that, when this lens was designed, efforts were made to improve corner to corner sharpness. Perhaps that explains the extra elements in an f3.5 lens. Pentax was not trying to manufacturer a slower, less expensive wide angle lens for Pentax shooters on a budget" http://www.northcoastphotographer.net/blog/files/9796fda7af3e143f245985ca585defae-5.html