A bayonet mount uses a system of interlocking tabs to hold the lens in place, while a "C" mount uses a screw-threading to attach the lens to the body.

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Andrew Gingerich
Exploding Goldfish Films
Check out my vodcast on iTunes: http://phobos.apple.com/WebObjects/MZStore.woa/wa/viewPodcast?id=96931870
and my blog at http://www.exgfilms.com

Sounds like the Bayonet mounts would be more secure than C mounts. Do you lose anything image wise when using an adapter for C to Bayonet or vice versa?

I'm not an expert on this (my only experience in interchangeable lenses comes from still photography), but in my experience, yes, a bayonet is much more secure/easier to attach than a screw mount, and there should be no loss of quality if you use an adapter.

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Andrew Gingerich
Exploding Goldfish Films
Check out my vodcast on iTunes: http://phobos.apple.com/WebObjects/MZStore.woa/wa/viewPodcast?id=96931870
and my blog at http://www.exgfilms.com

thanks for the info