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ASTRO: M8 with a DSLR - M8_.25_size.jpg (1/1)
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ASTRO: M8 with a DSLR - M8_.25_size.jpg (1/1)
Wow, beautyfull!!!!!
Menno |
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ASTRO: M8 with a DSLR - M8_.25_size.jpg (1/1)
What ASA did you have the camera set at?
Joe "Robert Price" wrote in message ... |
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ASTRO: M8 with a DSLR - M8_.25_size.jpg (1/1)
Joe,
It was set at 400ASA. Robert On Mon, 23 Apr 2007 18:33:54 -0400, "J McBride" wrote: What ASA did you have the camera set at? Joe "Robert Price" wrote in message .. . |
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ASTRO: M8 with a DSLR - M8_.25_size.jpg (1/1)
Far less noise at that setting than the owl. Was it taken at a faster
setting? Rick Robert Price wrote: Joe, It was set at 400ASA. Robert On Mon, 23 Apr 2007 18:33:54 -0400, "J McBride" wrote: What ASA did you have the camera set at? Joe "Robert Price" wrote in message . .. |
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ASTRO: M8 with a DSLR - M8_.25_size.jpg (1/1)
Not less noise. Both at 400ASA. The Owl was cropped while the M8 was
full frame. The M8 1/4 reduction in image size reduces the appearance of noise by averaging 16 pixels. No such reduction with the Owl because ot its small size. On Wed, 25 Apr 2007 09:55:29 -0500, Rick Johnson wrote: Far less noise at that setting than the owl. Was it taken at a faster setting? Rick Robert Price wrote: Joe, It was set at 400ASA. Robert On Mon, 23 Apr 2007 18:33:54 -0400, "J McBride" wrote: What ASA did you have the camera set at? Joe "Robert Price" wrote in message ... |
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ASTRO: M8 with a DSLR - M8_.25_size.jpg (1/1)
Averaging rather than binning as an astro ccd would do? I usually take
my shots binned 2x2 which takes the data from four 9 micron pixels and adds them together as if they were one large 18 micron one. This better matches my average seeing. Gain is reset as well. The result is much like the scope running at f/5 rather than f/10 thus increasing the signal to noise ratio and reducing exposure time by a factor of 4. Averaging wouldn't decrease exposure time. I don't see how averaging would have as much to offer as binning when dealing with long exposure times. For daylight shots it would make sense as you already have plenty of light. I'd think they'd switch to binning for long exposures however. I'm just a beginner so probably overlooking something. Rick Robert Price wrote: Not less noise. Both at 400ASA. The Owl was cropped while the M8 was full frame. The M8 1/4 reduction in image size reduces the appearance of noise by averaging 16 pixels. No such reduction with the Owl because ot its small size. On Wed, 25 Apr 2007 09:55:29 -0500, Rick Johnson wrote: Far less noise at that setting than the owl. Was it taken at a faster setting? Rick Robert Price wrote: Joe, It was set at 400ASA. Robert On Mon, 23 Apr 2007 18:33:54 -0400, "J McBride" wrote: What ASA did you have the camera set at? Joe "Robert Price" wrote in message m... |
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ASTRO: M8 with a DSLR - M8_.25_size.jpg (1/1)
"Robert Price" wrote ... Not less noise. Both at 400ASA. The Owl was cropped while the M8 was full frame. The M8 1/4 reduction in image size reduces the appearance of noise by averaging 16 pixels. No such reduction with the Owl because ot its small size. Robert, Are you using dark frames? It would seem that going with say 2 minute sub-exposures would be best. You can grab about 5 or so darks and average them to reduce noise even further. George Normandin |
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ASTRO: M8 with a DSLR - M8_.25_size.jpg (1/1)
"Robert Price" wrote Beautiful picture Robert!! George N |
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