fast lens?

Started Dec 13, 2017 | Questions thread
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633 squadron
633 squadron Regular Member • Posts: 232
fast lens?

on many reviews you here things like this lenses is a lot faster because its f2.8 at 300mm compared to f5.6 at 300mm. does this mean faster focus speed or what?

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 633 squadron's gear list:633 squadron's gear list
Panasonic Lumix DMC-G7 Panasonic Lumix G Vario 14-42mm F3.5-5.6 II ASPH Mega OIS Panasonic 100-300mm F4-5.6 II
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