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

Started Apr 17, 2011 | Discussions thread
Skywalker23
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Re: If shooting at f/22, is a fast 1.8 lens still considered fast?
In reply to cuteo100, Apr 17, 2011

No, the f/ value is a measure of how fast a lens is. If f/ values were horsepower, as in a car engine, "stopping down" your lens from f/1.4 to f/8 would be like decreasing your horsepower from 400 to 75.

Yes, the engine is capable of 400 horsepower, but it has been instructed to only use 75. Same with lenses; it is capable of f/1.4, but it is being told to only use f/22.

cuteo100 wrote:

If shooting at f/22, is a fast 1.8 lens still considered fast? (as compared to a slow lens, if all things being equal) Thanks.

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