Maybe one of these similar products would be of interest:-

Microscope Camera Lens 38MP Full H_D H_DMI USB 60FPS Camera 5.0-50mm F1.4 Lens Industry Live Camera for Machine vision Imaging, 5.0mm-50mm F1.4 Lens

Zqunzh 50mm F1.4 CCTV TV Movie lens+C Mount+Macro ring for Pentax Q / Q10 / Q7 / Q-S1 C-PQ

Pentax-DA smc 50mm f1.8 Lens

Pentax-FA SMC 50mm f1.4 Lens

Pentax-D FA* HD 50mm f1.4 SDM AW Lens - Black