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Theoretically there could be a zoom that is an F/1.2, the issue would be the size and expense to manufacture ruins any possible commercial viability.
by jsjohnst 5y ago
Theoretically there could be a zoom that is an F/1.2, the issue would be the size and expense to manufacture ruins any possible commercial viability.
- moron4hire 5y agoYes, that is exactly why. There is a bit of an "unobtanium" problem in that materials science has been having in this problem for quite a long time. Barring a revolutionary new take on legs materials, this is about as good as it gets, cross what people are actually working to pay for
- mnw21cam 5y agoIt's more the case that the wider the aperture, the more the thing needs correcting for aberrations. A fixed focal length prime lens is much easier to correct than a zoom lens, because all the aberrations can be optimised down in the design. For a zoom lens, the aberrations need to be controlled while parts of the lens are moving around in weird ways. I have a 18-50mm F/2 zoom lens. It's a really nice piece of kit, but I noticed that at the extreme wide end of the zoom range, it has quite catastrophic coma. Zoom lenses are hard.