"Fast" Vs "Slow" lenses

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bmdncl Regular Member • Posts: 108
"Fast" Vs "Slow" lenses

Everyone talks about some lenses in the system being way quicker or slower to focus? Is this depicted in anyway within the naming of the lenses or is it just newer vs older or some other spec?

I gather the 50-140 is "quick"...is it quicker than say the 55-200 in good light situations or better in bad light or both etc....hope that makes sense. Its ALOT of money to spend to find out that it won't perform as hoped

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