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

Started Apr 17, 2011 | Discussions thread
Ronj2 Senior Member • Posts: 1,195
Re: its funny

I think what edwardaneal is saying is that the AF sensor does not see the brightness effects of opening and closing the apeture of the lens only the DOF effect. The AF sensor is outside of the sensor plane and does not see the effects of a lens opeing up more than F5.6. The light the AF sensor sees does not get brighter, only darker with any given lens. I just have a hard time visulizing how it avoids the light effects of aperture changes larger than F5.6


Ron J

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