I've been looking into getting a wide angle adapter for my 18-55mm Canon kit lens and possibly my nifty fifty too if I can afford it. I'm mainly looking for a way to increase the possibilities open to me when photographing my architecture models for uni etc. What should I be looking into when purchasing a wide angle adapter. Searching amazon and ebay is a minefield of super cheap Chinese jobies which are temping due to their price. What could I expect from these super cheap options? With limited money I'm looking for the cheapest viable option. Thanks for looking.