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QC-Magnitude ? This is a long e-mail, if not interested you can stop read now. Many people interested in astronomy and variable stars can never afford to buy a “real” ccd-camera. However no you can modify a lot of other cameras, look at link: http://vsnet.geocities.com/jgroveuk/ExViewMod.html http://home.clara.net/smunch/wwhich.htm A bit problematic is the fact, the web- camera is immensely sensitive to the red and infrared portion of spectrum. This causes some difficulties in comparing the results with visual observations. But it starts to be a big problem when observing red, pulsating stars, as Miras and semiregulars. Some sort of visual filter is indispensable. Luckily, not in every field it is so. For example, when observing eclipsing binaries, the most important thing is the variability itself and the time it happens in. The described camera yields some hopes for constructing an automated observatory able to observe thousands of stars. Now it's rather a promising enhancement of traditional (manual) observing…. Read more about this at link: http://sus.univ.szczecin.pl/~ecliptic/vesta3en.htm And I am very grateful for a comment. For my self I have a QuickCam b/w with this description: Texas Instruments TC255P Frame Transfer CCD Sensor Black & White sensor. Size : 324(H) x 243(V) pixels 10µm square pixels Size of the chip : 3,2 x 2,4mm Signal conversion rate : 12µV / electron Dynamic range : 66dB Readout noise : 62 electrons Low dark current on/off anti blooming Sensitivity : 350 mV/Lux. Good response in blue field. CCD-Spectral responsity: http://w1.217.telia.com/~u21702585/dok1.htm If I now doing some measurement on binary stars with this camera, what do I call the magnitude? QC or what. Or is observing with this camera only confusing and better do not do any observing whit it? I have also a 1004xa- camera under rebuilding ,can be seen under link: http://vsnet.geocities.com/jgroveuk/ExViewMod.html And when i start use this camera ,what kind of magnitude do i use? I use the cameras on a 254/1301mm Newton telescope, and motor drive. Well hopes you understand something of this :o) Regards Hans-goran
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