Bayonet Mount?

[JasonLambert]

I have two lenses with what I'm guessing to be bayonet mounts on them. is there a way to use them on my canon XSI?

Vivitar 28mm f2.8 wide angle
Samyang 28-70mm f3.5-4.5 macro

I cant seem to figure out what I need.

 

[KmH]

You have to determine what kind of mount are on the lenses.

The current canon mount is the EF or EF-S.

Compare to the closeup photos at:
Canon EF lens mount - Wikipedia, the free encyclopedia

Canon EF-S lens mount - Wikipedia, the free encyclopedia

If those don't match, Nikon uses the F-mount Nikon F-mount - Wikipedia, the free encyclopedia

and Pentax uses the K-mount. Pentax K mount - Wikipedia, the free encyclopedia

 

[Big Mike]

Long story => short....it's probably not worth the effort.