fine-camera-lenses Wide Filter Free Useful Information

Like others have said you get what you pay for. The lense is solid feeling and looks like it will last a while. It also a lot cheaper than other wide angle lenses you can buy. While it does a decent job of giving you more of the scene there is noticeable barreling and blurring at the edges especially in lower light and lense flare is a definite issue.

52MM Wide Angle + Macro Lens Filter & Telephoto Lens Filter for Canon, Nikon & Kodak
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Digital Concepts 1 2 4 10 Close-Up Macro Filter Set with Pouch (58mm)
Cokin BPW400 Filter Holder, P Series, Wide Angle
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Sigma  DG 52mm Wide Multi-Coated Circular Polarizer Filter
Canon EF 50mm f/1.8 II Camera Lens

fine-camera-lenses Wide Filter Free Useful Information