Hello, I have an Olympus e-500, and I'm looking to get a 50mm prime lens. I'm trying to go as inexpensive as possible, and as far as I know the cheapest Olympus Digital lens is around $400, where the Nikon or Canon's are around $150. I don't think it's possible, but is there any type of adapter to use cross brand lenses? Another option I'm looking at is buying the Olympus adapter to use the old SLR OM lenses- I saw an offbrand brass adapter for $20 off ebay, and see the 50mm f1.8 OM lenses for around $50 used... think it will be worthwhile at all? Thanks!