100–300 mm f/4.5-6.7 DL Sigma 105 mm f/2.8 EX DG Macro Sigma 120–400 mm f/4.5-5.6 APO DG OS HSM Sigma 135–400 mm f/4.5-5.6 APO ASP Sigma 150–500 mm f/5.0-6.3 DG OS HSM Sigma 170–500 mm f/5-6.3 APO ASP Sigma 180 mm f/3.5 EX Macro Sigma 300 mm f/2.8 EX DG Sigma 500 mm f/4 XQ Reflex (catadioptric) Sigma 500 mm f/4.5 EX DG Sigma 500 mm f/8 Reflex (catadioptric) Sigma 600 mm f/8 Reflex (catadioptric) Soligor Soligor 70–210 mm f/4.5 Soligor MC 80/135 f/4 dualfocal Soligor 85–205 mm f/3.8 Soligor MC 90 mm-230 mm f/4.5 Soligor 135 mm f/2.8 Soligor 200 mm f/2.8 Soligor 80/200 mm MC f/4.5 Soligor C/D 28–200 mm f/3.8-5.5 Macro Soligor 35-105/3.5 Macro Spiratone Spiratone was a company devoted to sell photographic accessories and manage to sell some lenses under their own brand name until it closed, very few were made for the K-mount, and none of them are known to be of good quality. Spiratone 400 mm f6.3 Spiratone 500 mm f8 (72 mm filter) Sun Sun 28–80 mm f3.5-4.5 Macro (62 mm filter) Sun 80–200 mm f4.5 Macro (55 mm filter) Sun 85–210 mm f4.8 telephoto zoom (55 mm filter) Sun 70–140 mm f3.8 auto zoom (49 mm filter) Sunagor Sunagor 75–300 mm F5.6 Suntop Suntop 28–135 mm f3.8-5.2 MC (67 mm filter) Takumar Takumar 135 mm f2.5 prime Takumar A 28–80 mm f3.5-4.5 Macro Tamron Tamron is a third party vendor of photographic lenses, quality among them varies a lot. It is important to distinguish the adaptall versions from everything else, the adaptall is a generic adapter that allowed Tamron to manufacture a single lens design for a wide range of cameras, and commercialize those for specific brands with the use of the Adaptall I and Adaptall II adapters. So there are Tamron Lenses on K-mount, and Tamron Adaptall I and II for K- and KA-mount adapters. More Information on the Adaptall can be found on the Tamron article of Wikipedia. Here the non-Adaptall versions: Tamron 10–24 mm f/3.5-4.5 Di II LD AF SP Aspherical (IF) Tamron 17–50 mm f/2.8 SP AF XR Di-II LD Aspherical IF Tamron 18–250 mm f/3.5-6.3 AF Di-II LD Aspherical IF Macro Tamron 18–200 mm f/3.5-6.3 XR Di-II LD IF (2008) Tamron 24 mm f/2.5 (Adaptall 2, two versions (01BB) and (01B) Tamron 28–75 mm f/2.8 SP AF XR Di LD Aspherical IF Macro Tamron 28–80 mm f/3.5-5.6