tripod said:
The 50mm f1.2 and 1.4 are quite spendy, and I'm cheap. How good is the 50 f1.7 or the 45mm f2? Can ayone direct me to a website more dedicated to Minolta film SLR?
The 50/1.7 is excellent. The 45/2 was a later-model, light-weight, "economy" lens that performs well optically, but it will feel cheap and look chintzy on your massive XK. (The lenses marked "MC Rokkor-X" would be the most age-appropriate and the best styling match for your camera.)
If you want a practical, useful lens that's as wild-looking as your camera, comes from the same era, and exemplifies the original thinking that used to characterize the best of Minolta's designs, be on the lookout for the 40-80/2.8 "gearbox" zoom lens.
It looks positively bizarre: all the controls are on a rectangular box that sticks out one side (hence the "gearbox" nickname) with focusing via a thumbwheel on the side of the gearbox and focal-length selection via a rotary joystick coaxial with the thumbwheel. It sounds nutty, but actually works very well: you can zoom and focus easily via a thumb on the bottom of the wheel, while supporting the lens comfortably on the flat bottom of the "gearbox." I had one of these for a while that I used with my XE-7, and it was a very practical outfit.
The lens was sharp, too. The reason Minolta did it that way was that it was one of the first zooms in which all the lens elements could move individually, a design feature that allowed enhanced performance at wide aperture. But the cams required were so complicated that Minolta couldn't design a way to fit them into the lens barrel -- so instead they put them in the box on the side.
Here's a picture I found, of the lens on an XD; you can see the zoom/focus control on the side of the box:
Picture credit:
http://www.trenholm.org/hmmerk/HMbook12.html