"That's low *aperture ratio*, not focal ratio."
The 'speed' of a lens is found by dividing the focal length by the aperture. This 'aperture ratio' is normally refered to as focal rario.
"I wouldn't say "normally"."
Must be the circles we run in. I bet I haven't heard aperture ratio used in describing the f-ratio of a lens twice.
Maybe just a regional difference in terminology. Where I grew up, we called a creek a "bayou". Here we call it a "brook".
The "ratio" being discussed is the "focal length" to "aperture" ratio.
Usually I hear this called the "focal ratio" and only occasionally do I hear someone say "aperture ratio" (it really is both ... if you wanted to be really specific then you'd use the term "focal length to apeture ratio" and that would eliminate all ambiguitity. But people like to shorten things.
Either term is correct (or at least correct enough that everyone else should know what you mean.)
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