If shooting at f/22, is a fast 1.8 lens still considered fast?

Started Apr 17, 2011 | Discussions thread
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Ronj2 Senior Member • Posts: 1,195
Re: tell me Steve

It would appear that modern Af sensors will benifit from faster glass. Even if the Af has an aperture of 2.8 or F5.6, a brighter lens will allow more light to the AF sensors aperture. The AF sensor may be limited by it's own aperture but the light it sees is influenced by the light the lens lets in, so it makes sense that a faster lens will allow the AF sensor to see it's maximum potential of light more often than a slow lens in certian situations.

That's the way I see it anyway, maybe I'm wrong.

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Ron J

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