The Canon EF 50mm f/1.0 lens was the fastest SLR lens in production before it was discontinued in 2000 and replaced with the 50mm f/1.2. This lens retail price was $4,21o, and there aren’t too many copies of this lens floating around on the used market, you may find one at ebay.
This 50mm f/1.0 lens actually wasn’t very good… except for the bokeh. Here are some of sample images and bokeh:
You can see more sample images taken by Bryan Soderlind .
What Soderlind said about this len:
The Canon 50mm F/1 lens is a rare, discontinued, and expensive lens Canon only made for a few years. The lens is made to shine at lower apertures and the look you get at 1.0 is like no other lens made. There is somewhat of a frustrating learning curve when using the lens at 1.0, getting anything in focus takes practice.
Strong backlighting tends to give a very wild unique flare and certain light sources produce a rainbow effect I haven’t seen produced by any other lenses. The lens really isn’t any better than other 50mm Canon lenses I’ve used once you stop down past 2.8, this lens was made for the wider apertures.
There is also a heavy vignette at wide open apertures, this could be seen as a positive or negative depending on your preference. The price and the ability to find the lens is a definite deterrent, but for me it was well worth it.