When you get into wide and ultra-wide angle lenses, two of the most common focal lengths are 16mm and 24mm. There is a significant difference between those focal lengths, though, and something in between can be just the ticket, which is where the 20mm focal length comes in. With many options, you might wonder which is right for you. This fantastic video review features an experienced lens tester detailing five of the sharpest 20mm options you can purchase.
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