How wide can an ultra-wide go? It’s a question you’ll find yourself asking when you get ready to mount the Voigtländer 10mm f/5.6 Hyper-Wide Heliar: the widest rectilinear lens ever made for a camera. As soon as you look through the viewfinder with this lens mounted, you’ll have your answer: almost unfathomably wide.
The 10mm f/5.6 is a one-of-a-kind lens: the first lens ever made with a 10mm focal length to cover a full-frame sensor that isn’t a fisheye lens. Fisheye lenses are still the ultra-wide champs: they can cover a full 180 degrees corner to corner, but with the unmistakable bowing of straight lines to accomplish the feat. This Voigtländer lens sets a new bar in rectilinear width, besting the 11-24mm Canon lens that made headlines when it was announced last February. Prior to that lens, there were a small handful of lenses with a 12mm focal length (and Sigma had an APS-C equivalent 8mm lens). But 10mm has been unheard of before now. While a 1mm advantage may sound small, with focal lengths this wide, it’s a visible difference in field of view. The 11-24mm goes as wide as 126.5 degrees, while the 10mm f/5.6 increases that 130 degrees.
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https://admiringlight.com/blog/review-voigtlander-10mm-f5-6-hyper-wide-heliar-sony-e-mount/
