I have a perfectly nice Nikon 12mpix, so its not on account of being cheap, though I am,
and proud, and cheap people are the SOTE. But if I were interested in salvaging a smallish
zoom lense and fitting it to this godawful Vivitar, just for fun, it came with with what
I think is called a barrel lense, which is threaded, what specs can I presume to be
suitable?