If you want a cheap and cheerful Canon macro lens for capturing macro and close up shots of flowers and still lives the 60mm Canon macro lens is awesome. I wouldn't recommend it for taking photos of insects and minibeasts though.
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If you want a cheap zoom lens for your Canon slr camera that is capable of capturing awesome images I recommend the Canon 18mm - 200mm zoom. OFr a full review of this awesome lens take a look at this article, which also includes other cheap Canon lenses that are worth looking at.