I am planning to pick up a couple of older lenses and adapters for my new G5. I was looking in a shop in town today and was offered two Taylor Optics Series V wide angle auxiliary lenses. I can't seem to find much info about them other than there is a set currently on ebay for $500. Does anybody know anything about these? It looks like they screw on to another lens, but they don't say what type. What type of lens would I use them with, or how would I mount them on my G5? And should I pick them up? Thanks for any input.