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#1
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Night vision equipment
Just curious: I would imagine that these units contain monochrome
sensors with large pixels and due to the high-ISO race of the past years, current DSLR sensors shouldn't be noisier. Or does military grade night vision equipment contain sensors which are less noisy than current DSLR sensors? Or is perhaps the image processing software which makes the difference? -- Alfred Molon ------------------------------ Olympus E-series DSLRs and micro 4/3 forum at http://tech.groups.yahoo.com/group/MyOlympus/ http://myolympus.org/ photo sharing site |
#2
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Night vision equipment
Alfred Molon wrote:
Just curious: I would imagine that these units contain monochrome sensors with large pixels and due to the high-ISO race of the past years, current DSLR sensors shouldn't be noisier. Or does military grade night vision equipment contain sensors which are less noisy than current DSLR sensors? Or is perhaps the image processing software which makes the difference? Or perhaps they work on a different principle. D |
#3
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Night vision equipment
In article , David Hare-Scott says...
Or perhaps they work on a different principle. Indeed - just read the wikipedia article. I'm just a bit surprised that vacuum tubes are still used for this purpose, now that they've been replaced by solid state devices in most other applications. What (equivalent) ISO sensitivity does night vision equipment have? 1 million? -- Alfred Molon ------------------------------ Olympus E-series DSLRs and micro 4/3 forum at http://tech.groups.yahoo.com/group/MyOlympus/ http://myolympus.org/ photo sharing site |
#4
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Night vision equipment
On Wed, 20 Feb 2013, Alfred Molon wrote:
Just curious: I would imagine that these units contain monochrome sensors with large pixels and due to the high-ISO race of the past years, current DSLR sensors shouldn't be noisier. Or does military grade night vision equipment contain sensors which are less noisy than current DSLR sensors? Or is perhaps the image processing software which makes the difference? I haven't a clue, but you do realize that night vision scopes are old? I remember reading about them in Popular Science or Popular Mechanics in the sixties, when the magazines were still their smaller size. I can't remember what was involved back then, but you could even buy the needed tubes on the surplus market. So either they are still analog, or they've moved to something digital, but the concept doesn't have to be digital. Michael |
#5
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Night vision equipment
"David Hare-Scott" wrote:
Alfred Molon wrote: Just curious: I would imagine that these units contain monochrome sensors with large pixels and due to the high-ISO race of the past years, current DSLR sensors shouldn't be noisier. Or does military grade night vision equipment contain sensors which are less noisy than current DSLR sensors? Or is perhaps the image processing software which makes the difference? Or perhaps they work on a different principle. D The electron magnification tubes might have a slight persistence delay, but to get high iso, long integration times are used in sensors, as well as thermoelectric cooling. I notice delays when viewing my old Sony night vision camcorder. Cameras don't slow own sweep rates for integration times. I think they just average frames. Bigger pixels are a good thing. Greg |
#6
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Night vision equipment
gregz wrote:
"David Hare-Scott" wrote: Alfred Molon wrote: Just curious: I would imagine that these units contain monochrome sensors with large pixels and due to the high-ISO race of the past years, current DSLR sensors shouldn't be noisier. Or does military grade night vision equipment contain sensors which are less noisy than current DSLR sensors? Or is perhaps the image processing software which makes the difference? Or perhaps they work on a different principle. D The electron magnification tubes might have a slight persistence delay, but to get high iso, long integration times are used in sensors, as well as thermoelectric cooling. I notice delays when viewing my old Sony night vision camcorder. Cameras don't slow own sweep rates for integration times. I think they just average frames. Bigger pixels are a good thing. Greg Back in the 80's, I was reading what amateur astronomers were doing to their homemade circuits for taking pictures through telescopes. A lot of home brew. Cold sensors were a must. Greg |
#7
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Night vision equipment
In article ,
Alfred Molon wrote: Just curious: I would imagine that these units contain monochrome sensors with large pixels and due to the high-ISO race of the past years, current DSLR sensors shouldn't be noisier. Or does military grade night vision equipment contain sensors which are less noisy than current DSLR sensors? Or is perhaps the image processing software which makes the difference? They're vacuum tubes: http://en.wikipedia.org/wiki/Image_intensifier They can be integrated with digital sensors but the amplification happens by converting light to electrons then bouncing those electrons down a grid of tiny charged channels to multiply them. -- I will not see posts from Google because I must filter them as spam |
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