Opposite of the Objective Lens, What is it called?

[JBivens]

I want to take my 95MM Swaro glass off prior to hiking and put the 65MM on the eyepiece. Most of my Canon glass have a little plastic "cap " to protect the exposed internal glass from dust, ect...

What is the back of the lens called?

What is the little swaro cap called?

Does anyone know how I could acquire 1 or two?

Thank you

 

[jfk69]

Ocular lens.