[Blelidupgerie]

I got a friend who's been taking a lot of photos in a fish eye lens (either he's got a proper fish eye lens or he's got one of those adapters) and I like the effect ofit.

Anyway, I've found a couple of fish eye lenses but they're waaay too expensive (£300+). So thought I'd go for the cheap options so I can mess around with the effect, by purchasing one of those adapters from ebay. Yes those twist on adapters that you can get for about £40-£50.

However I'm a little confused from some of the information I have read online.

Some of the fish eye adapters come with a multiplier e.g. 0.22x / 0.30x/ 0.45x which make no sense to me. I read you mutliply whatever lens you're using with that multiplier and the end result is what the equivalent in length in real e.g. if I got a .22x and put it on my 50mm prime it'd be equivalent to 11mm.

Additionally, I'd like the fish eye effect to be properly rounded so will I be able to achieve it with the 50mm prime? I know the 350D (which I have) is a cropped senser and I've read even if I was to get a fish eye lens (like the Zenitar 16mm f2.8 for £100 from ebay) I wouldn't get the nice rounded effect since most fish eye lenses the rounded effect is towards the outside, thus since it's cropped it gets cut off.