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Space Forum / Astronomy / December 2006What are these white dots on a lunar photo?
http://www.lpi.usra.edu/resources/lunar_orbiter/bin/info.shtml?223 Click on the picture. There's a lot of white dots which are clearly some sort of noise on the film. Does anybody know why these imperfections appear? They're finger prints on the negative. Scott > http://www.lpi.usra.edu/resources/lunar_orbiter/bin/info.shtml?223 > > Click on the picture. There's a lot of white dots which are clearly > some > sort of noise on the film. Does anybody know why these imperfections > appear? Yep, sorry to have to agree. Great pictures but whoever handled this material needs a head modification - like a head removal?? If you want to be kind to him/her, buy a box of linen gloves for them. Note that the skin oils of some people are able to etch most things - in some cases, even stainless steel! > They're finger prints on the negative. > [quoted text clipped - 5 lines] >> sort of noise on the film. Does anybody know why these imperfections >> appear? ----------------- www.Newsgroup-Binaries.com - *Completion*Retention*Speed* Access your favorite newsgroups from home or on the road ----------------- Yup, people don't realize how dangerous human touch is to certain materials. We're slightly acidic(?) so anything we touch is going to get a dose of etching acid, and then the disintegration sets in. So during the holidays, be careful of that handshake or your palm may melt away, or that hug lest your clothing disintegrate, or heaven forbid, kissing; God Knows what bugs are sitting there patiently on that person's lips, just waiting for the next ride to hitch on to come by. (^_^) --- Dave > Yep, sorry to have to agree. Great pictures but whoever handled this > material [quoted text clipped - 17 lines] > Access your favorite newsgroups from home or on the road > ----------------- > They're finger prints on the negative. > > Scott I'm not so sure. Enlarge the image and you will see very distinct white dots. Others look like the lines left by lights on overexposed film. > http://www.lpi.usra.edu/resources/lunar_orbiter/bin/info.shtml?223 > > Click on the picture. There's a lot of white dots which are clearly > some > sort of noise on the film. Does anybody know why these imperfections > appear? The white "lines" in several places do bear a remarkable resemblance to fingerprints. How old was the film? There are also two triangular shaped dots that could be defects on the film. A few more details on what equipment was used in making these shots might help. I've recently completed a series of test shots at half moon using a digital CCD camera and I have no spurious spots anywhere (which help eliminate internal light reflection issues). The enlarged image looks a bit overexposed. Deliberate? >The white "lines" in several places do bear a remarkable resemblance to >fingerprints. How old was the film? There are also two triangular [quoted text clipped - 3 lines] >and I have no spurious spots anywhere (which help eliminate internal >light reflection issues). The image linked to at http://www.lpi.usra.edu/resources/lunar_orbiter/bin/info.shtml?223 was created by one of the Lunar Orbiters in 1966-67. See http://nssdc.gsfc.nasa.gov/planetary/lunar/lunarorb.html for more details on the Lunar Orbiter missions. The white spots were caused by defects in the film processing. The film was processed automatically on the spacecraft and the images transmitted to Earth, untouched by human hands. This Lunar Orbiter image is one of the great photographs of the 20th Century: http://www.donaldedavis.com/2004%20new/COPERNho.gif I remember it well. I was in college when it came out. Bud  SignatureThe night is just the shadow of the Earth. |
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