Why no zoom lenses lower than f2.8?

Started Dec 27, 2012 | Discussions thread
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hikerdoc
hikerdoc Senior Member • Posts: 1,082
Re: Why no zoom lenses lower than f2.8?

remember this is actually f/2.8, a ratio of focal length to aperture. the current 70-200 f/2.8 is under 9cm diameter. an f/2.0 would require about 10 cm diameter, an f/1.4 zoom to 200 would approach diameter of the 600 f/4. massive weight and prohibitive cost would be major factors.

 hikerdoc's gear list:hikerdoc's gear list
Carl Zeiss Distagon T* 2,8/21 Sigma 85mm F1.4 EX DG HSM Sigma 35mm F1.4 DG HSM Art Carl Zeiss Apo Sonnar T* 2/135
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