Do we still "need" fast lenses ?

Started 6 months ago | Discussions thread
JimKasson
JimKasson Forum Pro • Posts: 24,205
Re: Do we still "need" fast lenses ?
16

Stacey_K wrote:

Almost all lenses perform better 1-2 stops from wide open.

Only if they're designed that way. There's no reason a f/1.4 lens should be sharper at f/2.8 than an f/2.8 lens other than the constraints on the designer. If given anywhere near the same budget, the f/2.8 lens will be sharper wide open than the f/1.4 at f/2.8.

For an f2.8 lens, that means F4-f5.6. Start at f4 and you are now talking about f5.6 - f8.

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