What's a bayonet filter?

[Iron Flatline]

I'm evaluating a certain filter, which is apparently only available as a bayonet filter.

What is the bayonet? Can it cover a 77mm lens?

 

[Iron Flatline]

Bump!

 

[The_Traveler]

http://www.bhphotovideo.com/bnh/con...A=getpage&Q=Product_Resources/filterIntro.jsp

 

[Iron Flatline]

Thanks.