by Jakub

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It is pretty much impossible to build a lens with that wide of an aperture that is also so long. As mentioned, at 200mm the lens opening is 166mm at f1.2. This would be a physically immense lens, even more so a fi it's a zoom. If we restrict ourselves to an aperture that's realistic (say f2.8), the only issue is that such a lens will need to be very, very ...


The fastest zoom lens right now is the Sigma 18-35mm f/1.8 Building a 18-200mm f/1.2 might be possible but no one would buy it because it would probably weigh something like 35lbs and cost $35,000 or more.


The "only" is one of the problems. A 200mm f/1.2 lens needs an aperture of 166,67mm. That would be a huge, heavy lens! Look at this picture of a 200mm/2.0 prime(!): A large aperture means you need larger glass, too, and grinding large lenses precisely isn't easy. Super zoom lenses are difficult to build and are generally of inferior quality to prime ...


A lens and sensor are related in size. The giant telephoto works against a sensor that is 6 times as long, and 6 times as wide, as the superzoom mini camera's sensor. The result is a lens where each element is 6 times the diameter and 6 times the thickness. Distances between teh elements are also magnified by a factor 6. And the result: 6 * 6 * 6 = 216 ...


To build on the other answers, this is indeed caused by a lens with undercorrected petzval. It is also vignetted, but more in one plane than the other. Here you can see a ray intercept plot for a large format tessar lens, these are also known as RIM plots or H'-TanU' Curves. On a RIM plot of the line is clipped, it indicates vignetting. You will notice ...

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