The Voigtlander 12mm Viewfinder (Black) is a shoe-mounted viewfinder that is designed for use with a 12mm lens. This viewfinder has 5 lenses in 5 groups, magnification of x0.28, a 92% field of view, and a -0.32 diopter.
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This is well worth the difference in cost from the other 12mm viewfinder. There are two offered from Voigtlander, the original square one and then newer round version. the newer one is smaller and has bright lines. It is built like a tank and has surprising heft for its size. I love using this viewfinder. it is such a different perspective on the world. although there is no parallax correction because it is an external viewfinder, the results are only slightly different even when you're very close to the subject. the glass is crystal clear and very bright. even though this is in the hot shoe there is no worry that it will fall out. The built in hood keeps the glass more protected from daily use. using this on an M5