As expected from a $10 lens, it's plastic (except for the screw). The image is straightened but has a kind of fisheye effect. Again, this is a cheap lens that's good enough for everyday use, which is how I use it. That's why I gave 4 stars because I can't give 4.5. If you're on a budget, go ahead and buy. It certainly costs less than a couple of fancy coffee mugs.
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