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Adorama LED safelight
Does anyone have experience with the Adorama LED safelight?
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Adorama LED safelight
Not with Adorama's, but my red LED safelight went trough a 5min safety test
(coin on a pre-exposed piece of paper) with flying colors. Jorge (Richard Swanson) wrote in om: Does anyone have experience with the Adorama LED safelight? |
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Adorama LED safelight
"Richard Swanson" wrote in message om... Does anyone have experience with the Adorama LED safelight? Haven't tried it, but the laws of physics lead me to expect that LED safelights will be *very* safe. They emit absolutely no light outside the intended band of wavelengths. Filters can fade and become unsafe. LEDs can become dim, but they are still safe -- they don't start emitting unsafe wavelengths. |
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Adorama LED safelight
Jorge Omar wrote in message . 4...
Not with Adorama's, but my red LED safelight went trough a 5min safety test (coin on a pre-exposed piece of paper) with flying colors. Jorge Red and yellow LED safelights are different beasts. Do a search here for led safelight and you'll get some opinions, some of them contradictory. FWIW, I have made several led afelights and I've settled on red because of foggng with VC papers. My orange led safelight has been made safe with a sheet of rubylith. |
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Adorama LED safelight
From what I've read about:
- Leds are not so narrow band (mfg curves are linear, so they can fool the eye); that's why amber ones are not safe (the limit seems to be red- orange); - Do not overdrive them, or the bandwidth will incrase and they will not be safe anymore. Jorge "Michael A. Covington" wrote in : Haven't tried it, but the laws of physics lead me to expect that LED safelights will be *very* safe. They emit absolutely no light outside the intended band of wavelengths. Filters can fade and become unsafe. LEDs can become dim, but they are still safe -- they don't start emitting unsafe wavelengths. |
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Adorama LED safelight
"John Stockdale" wrote in message om... Jorge Omar wrote in message . 4... Not with Adorama's, but my red LED safelight went trough a 5min safety test (coin on a pre-exposed piece of paper) with flying colors. Jorge Red and yellow LED safelights are different beasts. Do a search here for led safelight and you'll get some opinions, some of them contradictory. FWIW, I have made several led afelights and I've settled on red because of foggng with VC papers. My orange led safelight has been made safe with a sheet of rubylith. Right, every LED emits only in the intended band of wavelengths -- BUT is that band of wavelengths safe? With a yellow or orange one and a fast multicontrast paper, possibly not. Red LEDs should be very safe with all papers. |
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Adorama LED safelight
On 23 Jun 2004 15:55:02 -0700, (Richard
Swanson) wrote: Does anyone have experience with the Adorama LED safelight? Reading this thread makes me curious: I'm relatively new at developing B+W, and would like to know if safelights can be used at the developing stage? I tend to fumble a bit with the tail-end of the roll that has allot of curl to it, and seeing what I'm doing would be helpful! Thanks in advance... jim h ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ http://www.jamesphotography.ca -free downloads -scanning service -home of the scanner bake-off Even a bit of humour... |
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Adorama LED safelight
Jim Hutchison wrote:
On 23 Jun 2004 15:55:02 -0700, (Richard Swanson) wrote: Does anyone have experience with the Adorama LED safelight? Reading this thread makes me curious: I'm relatively new at developing B+W, and would like to know if safelights can be used at the developing stage? I tend to fumble a bit with the tail-end of the roll that has allot of curl to it, and seeing what I'm doing would be helpful! Thanks in advance... jim h ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ http://www.jamesphotography.ca -free downloads -scanning service -home of the scanner bake-off Even a bit of humour... No safelight for B+W film. The best way to load those reels is to practice, practice and more practice. You'll get it. Good luck, Rich |
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Adorama LED safelight
"Michael A. Covington" wrote in message news:
........ Haven't tried it, but the laws of physics lead me to expect that LED safelights will be *very* safe. They emit absolutely no light outside the intended band of wavelengths. Filters can fade and become unsafe. LEDs can become dim, but they are still safe -- they don't start emitting unsafe wavelengths. Michael, I have never been in a position to contradict you before. This is my big chance! This is something that I first read in a post by Paul Butzi. You can examine the spectrum of the LED by viewing the reflections in a CD at the angle that gives the "rainbow" effect that we're all familiar with. I was amazed that my orange leds gave a spectrum right into blue-green. And that explained the fogging problems that I was having with VC paper. LED manufacturers often publish a graph of the spectral distribution, but the units of intensity are arithmetic, not logarithmic as are photographic data generally. Therefor what appears to be a low emission at a certain wavelength is not nearly as low as it appears as far as photographic exposure is concerned. With very red LEDs, you can have a bright darkroom, but the light is not easy on the eyes. |
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Adorama LED safelight
Just to stress the point - safelights are used only in the enlargement
stage - unless you are adept of some unusual alternative techniques. Jorge Jim Hutchison wrote in : On 23 Jun 2004 15:55:02 -0700, (Richard Swanson) wrote: Does anyone have experience with the Adorama LED safelight? Reading this thread makes me curious: I'm relatively new at developing B+W, and would like to know if safelights can be used at the developing stage? I tend to fumble a bit with the tail-end of the roll that has allot of curl to it, and seeing what I'm doing would be helpful! Thanks in advance... jim h ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ http://www.jamesphotography.ca -free downloads -scanning service -home of the scanner bake-off Even a bit of humour... |
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