Why no zoom lenses lower than f2.8?

Started Dec 27, 2012 | Discussions thread
hikerdoc Senior Member • Posts: 1,719
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
Nikon D4 Nikon D810 Nikon D500 Nikon AF-S Nikkor 50mm f/1.4G Nikon AF-S Nikkor 70-200mm f/2.8G ED VR II +10 more
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