A few words on Equivalence and comparing systems

Started Apr 2, 2013 | Discussions thread
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Re: A few words on Equivalence and comparing systems
In reply to olliess, Apr 3, 2013

olliess wrote:

texinwien wrote:

olliess wrote:

"Didn't want that light anyway."

It's the sensor not the lens, and JACS is talking about measures of lens performance w/r/t equivalence.

Since the "equivalent" lenses for different sensor sizes are being defined to be different focal lengths, the entrance pupils will necessarily be different sizes to produce the same f-number. So, the extra light collected ends up being baked into the lens specification.

Indeed. Fargin' equivalence. Forget to adjust one dimension and the whole thought exercise goes to pot. Apologies.

But I'd wager you knew this and were just trying to be witty. Unfortunately, you just ended up sounding obtuse.

Hmm. Okay.

Perhaps you were wittier than I gave you credit for.


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