Re: Etendue, f-number, and aperture diameter

Richard,

Thank you for taking time to insult me and make assumptions about my
background in physics and math. And thank you for correcting my typo.
I also inadverdently typed "10" instead of "100" at one point, did you
catch that too?

You are asking questions about my post without apparently reading it.
Before posting here, I had already computed the etendue for my two
comparison cases, I had already computed both the irradiance and total
photon flux at the image plane. Nevertheless, the debate that started
with my professor (a fellow in the OSA) and our post-doc about this
issue was ongoing, so I thought I would get some feedback from this
newsgroup to help settle our discussion.

You'd be surprised at how three well-educated people in physics and
optics can drive each other into confusion on the simplest topics when
standing around a whiteboard. Just discussing what we really mean by
"brightness" can be interesting. In fact, I intentionally phrased my
question that way to see what responses I would draw out from some of
the rather intelligent people on this board who frequently post very
well thought out (and non-insulting) replies. At least I got *one* of
those responses.

Personally, I think it is interesting to think about the answers to
"plain english" questions in science. Apparently, this drives you nuts.

By the way, how powerful is a magnet? : )

Michelle

-----Original Message-----
From: Richard J Kinch [mailto:kinch@xxxxxxxxxxx]
Posted At: Thursday, May 29, 2008 6:05 PM
Posted To: sci.optics
Conversation: Etendue, f-number, and aperture diameter
Subject: Re: Etendue, f-number, and aperture diameter

Michelle writes:

Does the bigger lens produce a 100x brigh[t]er image?

You are asking questions about physics while skipping the foundational
lessons. Go back and learn the definitions and the math. Otherwise it
is
like asking how "powerful" a magnet is.

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