The Yashica 35mm 2.8 Lens is actually, by todays standards, an Antique.
Yet I got it working on my Canon Rebel xti (I know, some of you would see this as an Antique too).
What you need is an Adapter Ring that has a chip that can read the focus information.
The Focus on this lens is Manual of course, which makes it more fun to experiment.
The Camera focal point light up when its focused, but it is tricky to find the right focus.
It has a very strong Bokeh effect
Here are some examples of how the Pictures on this look:
Breakfast Table
Bouquet of Roses
Apple tree Bud