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Before they were built into your phone\'s camera. From a Seattle
Filmwork\'s catalog found among a late relative\'s personal effects.
Winter, 1985:
https://imgur.com/a/YDakITI
He looks quite human to me, even though he did his own thinking.On Fri, 20 Jan 2023 22:00:04 -0500, bitrex <user@example.net> wrote:
Before they were built into your phone\'s camera. From a Seattle
Filmwork\'s catalog found among a late relative\'s personal effects.
Winter, 1985:
https://imgur.com/a/YDakITI
There\'s a story in
https://www.amazon.com/Genius-Life-Science-Richard-Feynman/dp/0679747044
about multilayer optical filters. Feynman was surely an alien life
form.
On 2023-01-21 16:49, John Larkin wrote:
On Fri, 20 Jan 2023 22:00:04 -0500, bitrex <user@example.net> wrote:
Before they were built into your phone\'s camera. From a Seattle
Filmwork\'s catalog found among a late relative\'s personal effects.
Winter, 1985:
https://imgur.com/a/YDakITI
There\'s a story in
https://www.amazon.com/Genius-Life-Science-Richard-Feynman/dp/0679747044
about multilayer optical filters. Feynman was surely an alien life
form.
He looks quite human to me, even though he did his own thinking.
What did he have to say about multilayer optical filters?
Jeroen Belleman
On Sat, 21 Jan 2023 19:14:03 +0100, Jeroen Belleman
jeroen@nospam.please> wrote:
On 2023-01-21 16:49, John Larkin wrote:
On Fri, 20 Jan 2023 22:00:04 -0500, bitrex <user@example.net> wrote:
Before they were built into your phone\'s camera. From a Seattle
Filmwork\'s catalog found among a late relative\'s personal effects.
Winter, 1985:
https://imgur.com/a/YDakITI
There\'s a story in
https://www.amazon.com/Genius-Life-Science-Richard-Feynman/dp/0679747044
about multilayer optical filters. Feynman was surely an alien life
form.
He looks quite human to me, even though he did his own thinking.
What did he have to say about multilayer optical filters?
Jeroen Belleman
As I recall, someone suggested something to him in a hallway
encounter. A few days later he delivered a complete theory of
multilayer optical filters.
He was far more intelligent than humans can be. His hobby, as a kid,
was seeking out difficult differential equation to solve.
At 13.5 nm, nothing refracts and nothing reflects... except extreme
multilayer coatings. That makes for interesting mask reducing optics.
On 2023-01-21 20:17, John Larkin wrote:
On Sat, 21 Jan 2023 19:14:03 +0100, Jeroen Belleman
jeroen@nospam.please> wrote:
On 2023-01-21 16:49, John Larkin wrote:
On Fri, 20 Jan 2023 22:00:04 -0500, bitrex <user@example.net> wrote:
Before they were built into your phone\'s camera. From a Seattle
Filmwork\'s catalog found among a late relative\'s personal effects.
Winter, 1985:
https://imgur.com/a/YDakITI
There\'s a story in
https://www.amazon.com/Genius-Life-Science-Richard-Feynman/dp/0679747044
about multilayer optical filters. Feynman was surely an alien life
form.
He looks quite human to me, even though he did his own thinking.
What did he have to say about multilayer optical filters?
Jeroen Belleman
As I recall, someone suggested something to him in a hallway
encounter. A few days later he delivered a complete theory of
multilayer optical filters.
He was far more intelligent than humans can be. His hobby, as a kid,
was seeking out difficult differential equation to solve.
At 13.5 nm, nothing refracts and nothing reflects... except extreme
multilayer coatings. That makes for interesting mask reducing optics.
Multi-layer optical filters obey the same laws as consecutive
pieces of coax alternating between two impedances, except that
the working frequency is much lower, and the coax is just a
single pixel.
Jeroen Belleman
Before they were built into your phone\'s camera. From a Seattle
Filmwork\'s catalog found among a late relative\'s personal effects.
Winter, 1985:
https://imgur.com/a/YDakITI
On Fri, 20 Jan 2023 22:00:04 -0500, bitrex <user@example.net> wrote:
Before they were built into your phone\'s camera. From a Seattle
Filmwork\'s catalog found among a late relative\'s personal effects.
Winter, 1985:
https://imgur.com/a/YDakITI
There\'s a story in
https://www.amazon.com/Genius-Life-Science-Richard-Feynman/dp/0679747044
about multilayer optical filters. Feynman was surely an alien life
form.
On 21/01/2023 03:00, bitrex wrote:
Before they were built into your phone\'s camera. From a Seattle
Filmwork\'s catalog found among a late relative\'s personal effects.
Winter, 1985:
https://imgur.com/a/YDakITI
Analogue traditional dye and gelatine optical filters are still
available to professional photographers today. eg
https://www.srb-photographic.co.uk/square-filters-1222-c.asp
On Mon, 23 Jan 2023 11:26:02 +0000, Martin Brown
\'\'\'newspam\'\'\'@nonad.co.uk> wrote:
On 21/01/2023 03:00, bitrex wrote:
Before they were built into your phone\'s camera. From a Seattle
Filmwork\'s catalog found among a late relative\'s personal effects.
Winter, 1985:
https://imgur.com/a/YDakITI
Analogue traditional dye and gelatine optical filters are still
available to professional photographers today. eg
https://www.srb-photographic.co.uk/square-filters-1222-c.asp
Is there any reason to use a filter in digital photography? Imager
chip pixels have extreme dynamic range and one can digitally
post-process an image.
On Mon, 23 Jan 2023 11:26:02 +0000, Martin Brown
\'\'\'newspam\'\'\'@nonad.co.uk> wrote:
On 21/01/2023 03:00, bitrex wrote:
Before they were built into your phone\'s camera. From a Seattle
Filmwork\'s catalog found among a late relative\'s personal effects.
Winter, 1985:
https://imgur.com/a/YDakITI
Analogue traditional dye and gelatine optical filters are still
available to professional photographers today. eg
https://www.srb-photographic.co.uk/square-filters-1222-c.asp
Is there any reason to use a filter in digital photography? Imager
chip pixels have extreme dynamic range and one can digitally
post-process an image.
On 23/01/2023 15:23, John Larkin wrote:
On Mon, 23 Jan 2023 11:26:02 +0000, Martin Brown
\'\'\'newspam\'\'\'@nonad.co.uk> wrote:
On 21/01/2023 03:00, bitrex wrote:
Before they were built into your phone\'s camera. From a Seattle
Filmwork\'s catalog found among a late relative\'s personal effects.
Winter, 1985:
https://imgur.com/a/YDakITI
Analogue traditional dye and gelatine optical filters are still
available to professional photographers today. eg
https://www.srb-photographic.co.uk/square-filters-1222-c.asp
Is there any reason to use a filter in digital photography? Imager
chip pixels have extreme dynamic range and one can digitally
post-process an image.
Yes. The most common reason would be to photograph in some narrow
wavelength band to isolate particular elements. Scientific imaging
tends to be done with monochrome CCDs and very well characterised glass
filters in astronomy and fluorescence microscopy for example.
https://astrobackyard.com/narrowband-imaging/
Most colour Hubble shots are in SII, Halpha, OIII narrow band as R,G,B.
You can get a roughly plausible colour image from Halpha to R and OIII
496nm to a turquoise green using two bandpass filters.
Single shot colour imaging is popular with hobby astronomers, but even
there many push the technique using narrowband filters (which helps cut
out a lot of the light pollution).
In discussions about lights near observatories they offered to use
yellow LEDs as an alternative to LPS - missing the point that it wasn\'t
the yellow light so much as the very narrow waveband it pollutes (and
sodium is so ubiquitous there is always some sky glow at sodium D lines.
On 21/01/2023 03:00, bitrex wrote:
Before they were built into your phone\'s camera. From a Seattle
Filmwork\'s catalog found among a late relative\'s personal effects.
Winter, 1985:
https://imgur.com/a/YDakITI
Analogue traditional dye and gelatine optical filters are still
available to professional photographers today. eg
https://www.srb-photographic.co.uk/square-filters-1222-c.asp
Edmund Scientific have an even wider range for filters for science and
industry including dopes glasses and dichroic filters (for a price).
https://www.edmundoptics.co.uk/c/optical-filters/610/
On Mon, 23 Jan 2023 11:26:02 +0000, Martin Brown
\'\'\'newspam\'\'\'@nonad.co.uk> wrote:
On 21/01/2023 03:00, bitrex wrote:
Before they were built into your phone\'s camera. From a Seattle
Filmwork\'s catalog found among a late relative\'s personal
effects. Winter, 1985:
https://imgur.com/a/YDakITI
Analogue traditional dye and gelatine optical filters are still
available to professional photographers today. eg
https://www.srb-photographic.co.uk/square-filters-1222-c.asp
Is there any reason to use a filter in digital photography?
Imager chip pixels have extreme dynamic range and one can digitally
post-process an image.
I was thinking about the \"traditional dye and gelatine optical
filters\" used by \"professional photographers\", not high-Q optical
filters used by scientists. Wedding pictures and stock images can be
post-processed for color and effects.