Why not a 12-35 F1.8 - F2.8?

Started Apr 2, 2014 | Discussions thread
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tt321 Senior Member • Posts: 7,802
Re: Conservatism

Fredrik Glckner wrote:

I think it comes down to conservatism. People who buy the high end zoom lenses expect that they have a constant aperture.

While I am certainly not an expert in lens design, I think that making the lens so that it had an aperture of f/2 in the wide end would not make it a lot more expensive or heavy. But the market for lenses like this expects a constant aperture. A variable max aperture is often viewed as a poor solution.

There is a more or less standard method of designing constant max aperture zooms. It's kind of formulaic - use that method and one of the consequences is constant max aperture.

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