Why are there no fast variable f-number zoom lenses?

Started Mar 13, 2017 | Discussions thread
GeraldW Veteran Member • Posts: 7,977
Re: Why are there no fast variable f-number zoom lenses?

Back in the film era, there were some faster zooms.  Pentax had a 40-80 mm f/2.8-4.  Vivitar, in their Series 1 lenses had a 70-210 f/2.8-4 and a 28-105 f/2.8-3.8.  Both very good lenses optically, and well made; but not nearly as big, heavy, and expensive as the 70-200 f/2.8 lenses.  Kino Precision made some of those Vivitars, and also had their own line under the Kiron name with similar f/#.

The question is why they all went away.

Also, there are a lot of fast variable (and fixed) f/# lenses out there on fixed lens cameras.  Integration into the camera and smaller sensors help keep the cost and size down and a number of cameras have f/1.8 lenses that zoom to f/2.8.

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