Forum: Digital SLR Cameras
May 16th 09, 08:18 AM Posted to rec.photo.digital.slr-systems
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Replies: 69
Views: 3,462
UV filters - What's ?multi-coated"?
I'm actually a professor who
actually teaches this in senior level courses.
http://illinois.edu/ds/search?search=doug+mcdonald&search_type=all
"No results returned."
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Forum: Digital SLR Cameras
May 16th 09, 08:14 AM Posted to rec.photo.digital.slr-systems
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Replies: 69
Views: 3,462
UV filters - What's ?multi-coated"?
You will note, to your amusement, that they don't actually call it
"heat", this is too obvious.
Sorry, I am not amused by you citing a 35-year-old textbook that doesn't
"actually call" out your...
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Forum: Digital SLR Cameras
May 15th 09, 06:06 AM Posted to rec.photo.digital.slr-systems
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Replies: 15
Views: 809
Document Lens
Steven Green writes:
If quality actually mattered what would you use?
I was thinking a handy gadget would be a flat plate of glass with struts
and handles to hold your camera away a certain...
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Forum: Digital SLR Cameras
May 15th 09, 05:53 AM Posted to rec.photo.digital.slr-systems
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Replies: 69
Views: 3,462
UV filters - What's ?multi-coated"?
Doug McDonald writes:
radiation as heat is different from heat in matter.
"Radiation as heat"? Sorry, this sort of gibberish proves you don't
understand physics at a high school level, much...
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Forum: Digital SLR Cameras
May 12th 09, 08:28 AM Posted to rec.photo.digital.slr-systems
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Replies: 69
Views: 3,462
UV filters - What's ?multi-coated"?
DRS writes:
You slipped from saying the greenhouse effect is
pseudo-science, which it manifestly is not, to saying the greenhouse
analogy is false, which is arguable.
If the language is...
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Forum: Digital SLR Cameras
May 12th 09, 06:08 AM Posted to rec.photo.digital.slr-systems
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Replies: 69
Views: 3,462
UV filters - What's ?multi-coated"?
DRS writes:
I would love to see you in a locked room trying to defend the
proposition that the greenhouse effect is pseudo-science with certain
professors of physics, meteorology and earth...
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Forum: Digital SLR Cameras
May 12th 09, 05:59 AM Posted to rec.photo.digital.slr-systems
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Replies: 69
Views: 3,462
UV filters - What's ?multi-coated"?
Alan Browne writes:
Across a very wide bandwidth, only part of which is heat.
No, no, no. No part of the electromagnetic spectrum is "heat". Photons are
photons, varying only in wavelength....
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Forum: Digital SLR Cameras
May 12th 09, 05:55 AM Posted to rec.photo.digital.slr-systems
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Replies: 69
Views: 3,462
UV filters - What's ?multi-coated"?
Kennedy McEwen writes:
"In physics and thermodynamics, heat is any transfer of energy from one
body or system to another due to a difference in temperature."
First, you are foolish to cite...
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Forum: Digital SLR Cameras
April 29th 09, 08:24 AM Posted to rec.photo.digital.slr-systems
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Replies: 69
Views: 3,462
UV filters - What's ?multi-coated"?
Kennedy McEwen writes:
Your input to the thread to date has been solely one of ignorance of
physics and denial that heat is the transfer of energy between bodies
by any means, due to their...
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Forum: Digital SLR Cameras
April 28th 09, 08:00 AM Posted to rec.photo.digital.slr-systems
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Replies: 0
Views: 382
Adorama Camera.... Good deal or what?????
infiniteMPG writes:
Just curious if anyone has experience buying from them what it was
like?
I buy several cameras a week for my instrumentation work. Adorama, B&H,
KEH, get almost all my...
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Forum: Digital SLR Cameras
April 28th 09, 07:51 AM Posted to rec.photo.digital.slr-systems
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Replies: 69
Views: 3,462
UV filters - What's ?multi-coated"?
Chris Malcolm writes:
I note that going by the explanations you've posted so far in this
thread that you don't appear to have any physics, just some confused
dogmatisms.
Dogmatisms? You are...
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Forum: Digital SLR Cameras
April 25th 09, 04:07 AM Posted to rec.photo.digital.slr-systems
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Replies: 69
Views: 3,462
UV filters - What's ?multi-coated"?
Heat most certainly a "thing". In thermodynamics it always
has been so considered. Objects have a "content" of it.
Sure, if you want to spin sorcery with different meanings of "thing".
My point...
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Forum: Digital SLR Cameras
April 25th 09, 03:51 AM Posted to rec.photo.digital.slr-systems
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Replies: 69
Views: 3,462
UV filters - What's ?multi-coated"?
Kennedy McEwen writes:
"Thermal" sensors sense electromagnetic radiation, not heat. So they are
light detectors, not heat detectors. The heat is only implied.
Actually, all "thermal"...
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Forum: Digital SLR Cameras
April 23rd 09, 08:45 AM Posted to rec.photo.digital.slr-systems
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Replies: 69
Views: 3,462
UV filters - What's ?multi-coated"?
DRS writes:
I have distant memories of one professor emphasising that heat, strictly
speaking, is a verb and not a noun.
Cute but not quite apt.
Heat is property things have, not a thing...
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Forum: Digital SLR Cameras
April 23rd 09, 02:01 AM Posted to rec.photo.digital.slr-systems
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Replies: 69
Views: 3,462
UV filters - What's ?multi-coated"?
Kennedy McEwen writes:
Perhaps you would care to explain how thermal imaging sensors work if
not by infra-red radiated from heat sources.
"Thermal" sensors sense electromagnetic radiation, not...
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Forum: Digital SLR Cameras
April 20th 09, 03:55 AM Posted to rec.photo.digital.slr-systems
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Replies: 69
Views: 3,462
UV filters - What's ?multi-coated"?
David J Taylor writes:
Heat can also be transferred by conduction and convection, of course.
Right. Heat conducts, convects, and radiates: the holy trinity of
scientific fallacy.
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Forum: Digital SLR Cameras
April 18th 09, 07:18 AM Posted to rec.photo.digital.slr-systems
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Replies: 69
Views: 3,462
UV filters - What's ?multi-coated"?
David J Taylor writes:
Both "light" and "heat" are electromagnetic radiation, albeit of
differing wavelengths, and both certainly do "radiate".
No, no, no. Thank you for a perfect example of...
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Forum: Digital SLR Cameras
April 16th 09, 06:37 AM Posted to rec.photo.equipment.35mm,rec.photo.digital.slr-systems,alt.photography
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Replies: 324
Views: 17,429
Eyeglasses
Pat writes:
So when I had it, in my late 30s, the doctor did the monovision
thing. You would never know it unless you shut your dominant eye and
looked at something far away.
Monovision is...
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Forum: Digital SLR Cameras
April 16th 09, 06:34 AM Posted to rec.photo.digital.slr-systems
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Replies: 69
Views: 3,462
UV filters - What's ?multi-coated"?
Doug McDonald writes:
All light really **is** "radient heat".
Perhaps in your alchemist theory of heat, still taught in public schools
these days.
Whatever heat is, it does not "radiate", and...
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Forum: Digital SLR Cameras
April 16th 09, 06:29 AM Posted to rec.photo.digital.slr-systems
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Replies: 69
Views: 3,462
UV filters - What's ?multi-coated"?
Michael Benveniste writes:
Which are you saying "no" to?
UV light ages things? No. All light ages things. Thus the comparison to
the public school IR=heat pseudo science.
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Forum: Digital SLR Cameras
April 11th 09, 12:49 AM Posted to rec.photo.digital.slr-systems
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Replies: 69
Views: 3,462
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Forum: Digital SLR Cameras
April 11th 09, 12:47 AM Posted to rec.photo.digital.slr-systems
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Replies: 69
Views: 3,462
UV filters - What's ?multi-coated"?
Michael Benveniste writes:
That's why historical documents are kept under UV filters, ...
No. Radiation ages, so you minimize all radiation. Anything not visible
should be extinguished since...
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Forum: Digital SLR Cameras
April 9th 09, 05:32 AM Posted to rec.photo.digital.slr-systems
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Replies: 69
Views: 3,462
UV filters - What's ?multi-coated"?
Michael Benveniste writes:
Have you ever seen a work of art ruined by UV fading while
under ordinary glass?
It doesn't have to be UV to cause fading. It's all radiation, UV, visible,
or...
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Forum: Digital SLR Cameras
April 9th 09, 05:30 AM Posted to rec.photo.digital.slr-systems
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Replies: 69
Views: 3,462
UV filters - What's ?multi-coated"?
Michael Benveniste writes:
You'll see that the addition of the "window glass" filter
attenuates more visible light (especially in the reds) than it
provides additional UV attenuation.
Your...
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Forum: Digital SLR Cameras
April 8th 09, 08:27 AM Posted to rec.photo.equipment.35mm,rec.photo.digital.slr-systems,alt.photography
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Replies: 324
Views: 17,429
Eyeglasses
Paul Furman writes:
They had a new gizmo that photographs the retina to look for diseases &
stuff. I came out OK on that. I asked to have the images emailed to
me... not yet... What it does...
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