I bought this product to use with my Canon 60D. The adapter had some issues with my 18-135mm, but the adapter works fine after a few ttys. It fits my 50mm with no problems. The fisheye effect works as long as you zoom out fully. The vignette gives it a classic fisheye look, which is fine if you're only using it for that purpose. However, it loses its impact when zoomed in and eventually blurs the image and makes autofocus impossible. Likewise, it didn't really have any usable effect on my 50mm lens, other than adding a blurry blur around the subject that was in focus, which might be cool for artistic effects, but not anything else. In general, I use it to record for hip-hop. events, as well as a breakdance promo video which is perfect for me. $30 to get that special prospect is worth it if you're on a tight budget. But don't buy it with high expectations and don't expect it to be your last fisheye option in the future. But like I said, it costs money for what it does.
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