Thank you all, very much appreciated

It all makes sense now. I wasn't sure if it was to do with larger aperture size (or "big 'ole" as I like to think of it

) or whether it was related to focusing speed/motor.
Quote:
Originally Posted by danpen
Bigger heavier lenses roll down the hill and into the lake "faster" when you drop them, hence "fast lens" 
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LOL - thanks I'll bear that in mind