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#1
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CCD Camera design
Hi
I want to build my own astronomical camera. I don't have decided which I'll use. I want to put a color CMOS sensor but many web sites relates that CMOS sensors are not very good (high dark level) I've seen a color CMOS sensor with 1,3 Mpixel (1280x1024) at a very low price (about $140). For best performance, do I use a color sensor or B&W sensor ? In term of sensitivy, dark noise which is the best (colour or B&W)? Cordially Alain |
#2
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CCD Camera design
"snip I want to build my own astronomical camera. snip This site is a good read. I've almost finished my camera and the instructions have generally been clear. http://www.astrosurf.com/audine/English/index0.htm There is also a North American site called Genesis. I've forgotten where it is but the ever-reliable Google will find it for you. |
#3
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CCD Camera design
Hi folks,
maybe it is interesting for you that a astronomical camera called "Platinum" like Audine / genesis is available as Kit or as complete camera from this site too. have a look to www.trinityccd.de Also available are many parts and modules for general use in CCD-Camera constructions like cooling components, cool-chambers, peltiers, Cases, Interfaces, USB-Converters and such nice things every body who wants to build CCD-Cameras. helmut |
#4
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CCD Camera design
Color CCDs achieve their results by placing a matrix of color filters over
the sensor array. This cuts down on the sensitivity of the array, increasing exposure times 2 to 3 times or more. It also reduces the resolution, since every three to four pixels are used to recreate a single color one. CMOS does have higher noise, and less low light sensitivity. The best color results are still from using a black and white CCD with a color filters, taking one exposure per filter. "Alain J" wrote in message ... Hi I want to build my own astronomical camera. I don't have decided which I'll use. I want to put a color CMOS sensor but many web sites relates that CMOS sensors are not very good (high dark level) I've seen a color CMOS sensor with 1,3 Mpixel (1280x1024) at a very low price (about $140). For best performance, do I use a color sensor or B&W sensor ? In term of sensitivy, dark noise which is the best (colour or B&W)? Cordially Alain |
#5
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CCD Camera design
Alain J:
I want to build my own astronomical camera. Tony Turner: This site is a good read. I've almost finished my camera and the instructions have generally been clear. http://www.astrosurf.com/audine/English/index0.htm ***** I think that M. Alain J might appreciate this link even more than the above: http://astrosurf.com/audine/index_fr.htm Davoud -- usenet *at* davidillig dawt com |
#6
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CCD Camera design
Check out the new color cameras coming from SBIG, David.
www.sbig.com They might make me trade in my ST-10 and filter wheel on the 11 Megapixel color unit. STU |
#7
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CCD Camera design
Admittedly, not looking at the site, but remembering how high priced the
SBIG cameras are, I don't think these will ever be in my future. Also, doesn't it obey the rule that a single shot color has exposure times two to three times longer for an individual exposure than the equivalent black and white? "SHFORSTER1" wrote in message ... Check out the new color cameras coming from SBIG, David. www.sbig.com They might make me trade in my ST-10 and filter wheel on the 11 Megapixel color unit. STU |
#8
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CCD Camera design
The price of the ST-2000 with the autoguider is $2995. Yes , Quantum Efficiency
is down, but this is a tradeoff. If I go to widefield with a color camera, I'll be spared all the stacking and still get good images. Hydrogen alpha would be out with these cameras, while pretty pictures would be in. STU |
#9
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CCD Camera design
"Davoud" wrote in message ... Alain J: I want to build my own astronomical camera. Tony Turner: This site is a good read. I've almost finished my camera and the instructions have generally been clear. http://www.astrosurf.com/audine/English/index0.htm ***** I think that M. Alain J might appreciate this link even more than the above: http://astrosurf.com/audine/index_fr.htm Davoud Tres bon! Merci. |
#10
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CCD Camera design
There is another big drawback to using a "color" detector.
You are stuck with the filters the manufacturer placed on the front of the chip. While fine for the daytime snapshot they do not have the high efficiency of or color balance available in astronomical filters. You could not do a Ha or OIII shot very well (yes you could put one of those filters in front of a color detector but I believe the results would be less than desired. Of course if you have already selected a specific chip there may not be a color filter option for it. You can only buy / get what they make. In general CMOS sensors do not offer as low as noise as CCDs. Howerver the new Canon digital SLR cameras have CMOS sensors and dark noise far below what my CCD based camera would produce (at the same sensor temperature). I wish you the best of luck on your endeavors. Please publish the design if you get it to go. Leonard On Fri, 06 Feb 2004 09:09:18 GMT, "David Nakamoto" wrote: Color CCDs achieve their results by placing a matrix of color filters over the sensor array. This cuts down on the sensitivity of the array, increasing exposure times 2 to 3 times or more. It also reduces the resolution, since every three to four pixels are used to recreate a single color one. CMOS does have higher noise, and less low light sensitivity. The best color results are still from using a black and white CCD with a color filters, taking one exposure per filter. "Alain J" wrote in message ... Hi I want to build my own astronomical camera. I don't have decided which I'll use. I want to put a color CMOS sensor but many web sites relates that CMOS sensors are not very good (high dark level) I've seen a color CMOS sensor with 1,3 Mpixel (1280x1024) at a very low price (about $140). For best performance, do I use a color sensor or B&W sensor ? In term of sensitivy, dark noise which is the best (colour or B&W)? Cordially Alain |
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