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Black and White Telescope
Hi All -
I was showing Mars to some friends, as I suppose a lot of us are lately(!) and a question came up that I couldn't eloquently explain - Why does Mars, or anyplanet, appear as "black and white" through a pretty good telescope, while all the photos are in glorious color? My weak explanation was that I "couldn't afford a color telescope," then I tried to remember the rods and cones in the eye and all that. But I know there is a better and shorter way to explain this... Thanks! Brian |
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I've never seen mars as B/W, it's always at lest orange in color.
-- "In this universe the night was falling,the shadows were lengthening towards an east that would not know another dawn. But elsewhere the stars were still young and the light of morning lingered: and along the path he once had followed, man would one day go again." Arthur C. Clarke, The City & The Stars SIAR www.starlords.org Bishop's Car Fund http://www.bishopcarfund.Netfirms.com/ Freelance Writers Shop http://www.freelancewrittersshop.netfirms.com Telescope Buyers FAQ http://home.inreach.com/starlord wrote in message ... Hi All - I was showing Mars to some friends, as I suppose a lot of us are lately(!) and a question came up that I couldn't eloquently explain - Why does Mars, or anyplanet, appear as "black and white" through a pretty good telescope, while all the photos are in glorious color? My weak explanation was that I "couldn't afford a color telescope," then I tried to remember the rods and cones in the eye and all that. But I know there is a better and shorter way to explain this... Thanks! Brian --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.512 / Virus Database: 309 - Release Date: 8/19/03 |
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Huh, well your explanation is good, but I am puzzled about the color. I am
not seeing any red through my telescope, although I am naked eye. Perhaps I have had more "distortion being in Los Angeles? It's been quite hot and "wavy" here... "Jonathan Silverlight" wrote in message ... In message , writes Hi All - I was showing Mars to some friends, as I suppose a lot of us are lately(!) and a question came up that I couldn't eloquently explain - Why does Mars, or anyplanet, appear as "black and white" through a pretty good telescope, while all the photos are in glorious color? My weak explanation was that I "couldn't afford a color telescope," then I tried to remember the rods and cones in the eye and all that. But I know there is a better and shorter way to explain this... I've never seen Mars as anything but pale orange with faint grey markings - I suspect that anyone who sees green markings is getting a contrast effect with the orange. But Mars is definitely bright enough to stimulate the rods in the eye (the colour sensors, if I guessed wrong) Similarly Jupiter appears yellow and brown and occasionally red (the "Great Red Spot" is currently quite pale, AFAIK), but it isn't as bright as the processed pictures you will see. That's the main problem - a lot of pictures are "enhanced". Even Saturn appears yellow. A very few deep-sky objects show colour, but normally they are too faint. The colour is real, though, and if you see a picture of a bright red nebula that's how it would appear if your eyes were sensitive enough. Hubble telescope pictures often use green for the wavelength that is really red, though. Only the Moon and Venus are really colourless under clear skies (and I suspect other people may argue this). To keep it short, if you're seeing a black and white planet I'm puzzled! It isn't really the "red planet", but it's much redder than most stars or planets. -- "Roads in space for rockets to travel....four-dimensional roads, curving with relativity" Mail to jsilverlight AT merseia.fsnet.co.uk is welcome. Or visit Jonathan's Space Site http://www.merseia.fsnet.co.uk |
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I was showing Mars to some friends, as I suppose a lot of us are lately(!)
and a question came up that I couldn't eloquently explain - Why does Mars, or anyplanet, appear as "black and white" through a pretty good telescope, while all the photos are in glorious color? My weak explanation was that I "couldn't afford a color telescope," then I tried to remember the rods and cones in the eye and all that. But I know there is a better and shorter way to explain this... Brian, This is often disappointing to amateur astronomers and newcomers; the fact that the view of the planets through the telescope is not nearly as magnificent as those seen in books. There are a couple of reasons for this. First, your eye is seeing the planet "instantly." A camera usually exposes the film for a significant period of time. This allows the sensitive film to absorb more light. Your eye constantly "refreshes" itself so you don't have to ability to just "not blink" and get more light to the cones in your eye. (This is a poor explanation so if anyone can elucidate on this point, I would be appreciative.) Secondly, most of those beautiful images you see are the juxtaposition of more than one photo taken with different filters. Filters are used to enhance certain features on planets and other celestial objects. They block certain wavelengths and let others through. For instance, now that Mars is so close, many of us take to viewing it nightly. I use a red filter to enhance the surface details and a yellow filter to enhance my view of the plains. Thirdly, a lot of the images in books and magazines are digitally touched up. The sky is darkened so it is truly black instead of a dark gray (as is common in light-polluted areas), and other techniques are used to enhance the image. The combination of juxtaposing long-exposure images taken with different filters and digital touchups accounts for the breath-taking images you see in print and media. With the naked eye, the views are not quite as magnificent if you're looking for instant gratification, but they are spectacular nonetheless. I hope this helps. Ron Sparks http://www.iSciFiStory.com |
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Yeah, Excactly. Surprising the lenses don't cough.
"pinkling" wrote in message ... On Wed, 27 Aug 2003 20:52:48 GMT in , graced the world with this thought: Perhaps I have had more "distortion being in Los Angeles? It's been quite hot and "wavy" here... ...with that really sweet natural green atmospheric filter.... |
#8
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Good info - thanks. I assume being in Palmdale you have pretty decent skies,
i.e. less light pollution than LA? "Starlord" wrote in message ... I get some waving when it first comes up, but once it's up about 11pm it's nice then and I'm north of you out past palmdale by 30 miles. -- "In this universe the night was falling,the shadows were lengthening towards an east that would not know another dawn. But elsewhere the stars were still young and the light of morning lingered: and along the path he once had followed, man would one day go again." Arthur C. Clarke, The City & The Stars SIAR www.starlords.org Bishop's Car Fund http://www.bishopcarfund.Netfirms.com/ Freelance Writers Shop http://www.freelancewrittersshop.netfirms.com Telescope Buyers FAQ http://home.inreach.com/starlord "pinkling" wrote in message ... On Wed, 27 Aug 2003 20:52:48 GMT in , graced the world with this thought: Perhaps I have had more "distortion being in Los Angeles? It's been quite hot and "wavy" here... ...with that really sweet natural green atmospheric filter.... --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.512 / Virus Database: 309 - Release Date: 8/19/03 |
#9
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Yes, thanks Ron - That's a great explanation. Thanks!
Brian "Ron Sparks" wrote in message ... I was showing Mars to some friends, as I suppose a lot of us are lately(!) and a question came up that I couldn't eloquently explain - Why does Mars, or anyplanet, appear as "black and white" through a pretty good telescope, while all the photos are in glorious color? My weak explanation was that I "couldn't afford a color telescope," then I tried to remember the rods and cones in the eye and all that. But I know there is a better and shorter way to explain this... Brian, This is often disappointing to amateur astronomers and newcomers; the fact that the view of the planets through the telescope is not nearly as magnificent as those seen in books. There are a couple of reasons for this. First, your eye is seeing the planet "instantly." A camera usually exposes the film for a significant period of time. This allows the sensitive film to absorb more light. Your eye constantly "refreshes" itself so you don't have to ability to just "not blink" and get more light to the cones in your eye. (This is a poor explanation so if anyone can elucidate on this point, I would be appreciative.) Secondly, most of those beautiful images you see are the juxtaposition of more than one photo taken with different filters. Filters are used to enhance certain features on planets and other celestial objects. They block certain wavelengths and let others through. For instance, now that Mars is so close, many of us take to viewing it nightly. I use a red filter to enhance the surface details and a yellow filter to enhance my view of the plains. Thirdly, a lot of the images in books and magazines are digitally touched up. The sky is darkened so it is truly black instead of a dark gray (as is common in light-polluted areas), and other techniques are used to enhance the image. The combination of juxtaposing long-exposure images taken with different filters and digital touchups accounts for the breath-taking images you see in print and media. With the naked eye, the views are not quite as magnificent if you're looking for instant gratification, but they are spectacular nonetheless. I hope this helps. Ron Sparks http://www.iSciFiStory.com |
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