A while ago I asked advise on this board from people using various fish-eye lenses, which of them was better, becuase I planned to buy a suspiciously cheap one from ebay.
Here is the discussion .
Now I can say that I made an experiment: my cheap (about 30$ including delivery) Bower fish-eye macro arrived and I even made few shots with it. Here is my impression.
This "lense" resembles a big fillter consisting of several parts and is to be used on top of a normal lense. I use it with Canon 400D camera and Tamron 18-200mm (it's already a bit extreme, but works fine on travel and studio). The fish-eye's thread size is 58mm and to fix it with Tamron's 62mm thread I use an extension ring (7$ more).
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