My Icarex has a bayonet mount. I’m still learning about them but I was talking to a guy who had a newer one with a screw mount. Those are also compatible with Pentax I guess.
Still remember printing first first picture from my first Zeiss camera, a Contaflex about fell over from surprise when I looked at it under normal light! I can see why people like Zeiss lenses! I learned that my Contaflex has what considered the lower quality Pentar lens! But is plenty good for me!