A few words on Equivalence and comparing systems

Started Apr 2, 2013 | Discussions thread
noirdesir
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Re: On "f/2.8 = f/2.8" and "being anal"
In reply to Alumna Gorp, Apr 3, 2013

Alumna Gorp wrote:

Great Bustard wrote:

Alumna Gorp wrote:

"in other words, simply because 35-100mm f/2.8 on mFT is equivalent to 70-200mm f/5.6 on FF"

Jeez man, not again, a 2.8`s, a 2.8 unless your being anal.

Saying "f/2.8 = f/2.8" is no more or less true than saying "50mm = 50mm".  In other words, it makes no more sense to compare f/2.8 on mFT to f/2.8 on FF than it does to compare 50mm on mFT to 50mm on FF.

Nope a 2.8 is a 2.8, and any exposer meter will tell you so

And which exposure meter will tell you that f/2.8 and 1/100 s on m43 will give you the same photon shot noise as f/5.6 and 1/100 s on FF?

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