> I also intend to connect them to my telescope to take some snaps - will either choice of lenses be better for this?
No. In general when one attaches a DSLR to a telescope or microscope, it is using some sort of adapter than turns the 'scope effectively into a big lens. In these cases you attach the 'scope directly to the camera, instead of a lens. So regardless of which lens(es) you have or own, you don't use them in this context.
_____ Brian... a bicoastal Nikonian and Team Member
My gallery is online. Comments and critique welcomed any time!