u/Few_Function3560

I recently bought a sirius 60-300mm 4.0-5.6 auto zoom macro lens on ebay that I tought would fit pentax k-mount but after trying it on, it wouldnt mount. I tried to find adapters but it seems hard to find anything compatible with the lens, or even what mount it is and I dont think its even possible to get one that would have infinity focus, I can also consider getting a teleconverter if one fits. First 4 fotos are the lens itself, 5th and 6th is a spare k mount lens I can use for parts if there is a way to adapt it(exakta 70-210mm 4.5-5.6) and then a foto from the users manual. Any info on how to adapt it or if its possible would be greatly appreciated. I can also send additional fotos of the lenses if needed.