Pentax 50mm is the standard focal length lens partnering with the Pentax K1000 except the maximum aperture of this lens is F1.7 rather than the more usual F2 enabling improved low light resolution. This example is an 'A' clean and optically clear condition. Both lens caps. Buy to use with your Pentax K mount or partner with a K&F high quality K - E adapter to use with your Sony full frame E-mount digital. . 

Pentax-A 50mm F1.7 K mount S#1811235