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

Started Apr 17, 2011 | Discussions thread
noirdesir
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Re: If shooting at f/22, is a fast 1.8 lens still considered fast?
In reply to Ronj2, Apr 18, 2011

Ronj2 wrote:

So it appears that phase AF only works at a slow F5.6 on Nikon bodies.

That applies to all autofocus (D)SLR cameras (ie, Sony/Minolta, Pentax, Olympus, Nikon) except some high-end Canon bodies.

Then there should be no difference in AF accuracy between a fast F2.8 like the 70-200vr2 lens and a slow F5.6 70-300vr consumer zoom in low light situations (other than focus speed). That's good to know.

The AF assembly (motor, gears, control electronics) in different lenses likely are not designed and built to the same standards, thus they could still contribute to some small AF errors.

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