Originally posted by Shooter1 The lens Mount isn't threaded. It has one little prong, but no threads. It appears that you would put the lens to the body of camera, and then turn it slightly to attach it. Again I apologise that I can't get pics on here.
I guess that pretty much says it all. No threads means no fit. Your lens has what is called a "bayonet"* mount
That being said, your camera
is compatible with an amazing number of vintage lenses in M42 screw mount. If you don't have a copy of the manual yet, it is available for free download from the Butkus site (donation appreciated)...
http://www.butkus.org/chinon/chinon/cs-4/cs-4.htm
Have fun!
Steve
* It attaches similarly to how a soldier fixes a bayonet to a rifle.