Does a faster lens need less light to make the same exposure?

Started Dec 11, 2012 | Discussions thread
Don Daugherty
Contributing MemberPosts: 641
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Re: Does a faster lens need less light to make the same exposure?
In reply to Dave Seeley, Dec 11, 2012

"Faster" glass comes from the maximum aperture it can attain.  If all of the elements of exposure are the same, then it will provide the same results.  Advantage:  You're 50L can open up to F/1.2, your 28-70 F/2.8 cannot.

D

Dave Seeley wrote:

I was thinking that it did... but

I had my 28-70 2.8L (Tv) at 1/200 iso 1000 metering at f3.5.

Swapped out my 50 1.2L at same (Tv) at 1/200 iso 1000 metering at f3.5.

Does that make sense? No advantage with the faster glass?

Thanks

Dave

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current kit: 5DmkIII, 5DmkII, 17-35/2.8L, 24-105is/4.0L, 28-70/2.8L, 70-200is/2.8L, 100 macro/2.8L, 50/1.2L, 2x II extender, 8x550ex Speedlites, Phottix Odin Flash Triggers

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