Nikon 300m f2.8 AF-I "buttons"

Joined
Aug 27, 2006
Messages
1,727
Location
The Garden State, USA
Ok so I just bought a the above lens from a Cafe member (thanks Jbear) and have the following dumb question. What are or is the purpose of the four round "buttons" on the end of the lens? They do not seem to have an obvious purpose. Any ideas?
 

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