The wide-angle lens that fuji makes for the s5100 is a 55mm diameter, .79x magnification.
This magnification seems to be a bit small and not worth the money, so I was looking at this Oly lens that is also a 55mm diameter, so I'm guessing it could be mounted on the s5100.
Is this true? Are different brands compatible with most other brands of cameras?
I hope I am not stuck buying this fujifilm wide-angle.

the oly lens is: http://www0.shopping.com/xPF-Olympus...gle_Conversion
here's the fuji lens:
http://www0.shopping.com/xPF-Fuji_WL...S_KIT_24349290

If your Fuji 5100 takes a 55mm thread
then you can put any 55mm lens on it
but thats not saying they will work good

the WCOM has a good reputation though

Ok, so what are the return policies on these lense? Is it possible to send it back if I find out it does not work correctly with my camera?
If not I will have to venture to a camera shop and see if I can try one out there. Know any reputable dealers?

that is different for each retailer/supplier
some onlines suppliers will, some wont
just like store fronts
talk to them about return policy "Before you Buy"