A few words on Equivalence and comparing systems

Started Apr 2, 2013 | Discussions thread
texinwien Veteran Member • Posts: 3,326
Re: A few words on Equivalence and comparing systems

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.


 texinwien's gear list:texinwien's gear list
Panasonic Lumix DMC-GM5 Olympus E-M5 II Olympus 12-40mm F2.8 OnePlus One Canon EOS 300D +20 more
Post (hide subjects) Posted by
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow