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ASTRO: Gamma Cygni region in RGB
this was taken using a 6x7 format Pentax SMC 300mm f/4 lens with an FLI
PL39000C one shot color camera. this is 39megapixels in RGB. total exposure was 11 x 15 minutes = 2h45m the stars have pretty bad haloes. I would imagine that is from the lens: there's a reason Pentax sold a very expensive APO lens in that same focal length/ratio http://www.narrowbandimaging.com/gam...pl39k_page.htm in the full resolution version, the sheer number of stars is staggering |
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ASTRO: Gamma Cygni region in RGB
Richard Crisp wrote:
this was taken using a 6x7 format Pentax SMC 300mm f/4 lens with an FLI PL39000C one shot color camera. this is 39megapixels in RGB. total exposure was 11 x 15 minutes = 2h45m the stars have pretty bad haloes. I would imagine that is from the lens: there's a reason Pentax sold a very expensive APO lens in that same focal length/ratio http://www.narrowbandimaging.com/gam...pl39k_page.htm in the full resolution version, the sheer number of stars is staggering Looks like the red is a bit out of focus compared to the other two colors. Did you refocus the individual filters with the black and white camera? Could you blur the other two channels to match the red or deconvolve the red to match the other two? Rick -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
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ASTRO: Gamma Cygni region in RGB
"Rick Johnson" wrote in message ster.com... Richard Crisp wrote: this was taken using a 6x7 format Pentax SMC 300mm f/4 lens with an FLI PL39000C one shot color camera. this is 39megapixels in RGB. total exposure was 11 x 15 minutes = 2h45m the stars have pretty bad haloes. I would imagine that is from the lens: there's a reason Pentax sold a very expensive APO lens in that same focal length/ratio http://www.narrowbandimaging.com/gam...pl39k_page.htm in the full resolution version, the sheer number of stars is staggering Looks like the red is a bit out of focus compared to the other two colors. Did you refocus the individual filters with the black and white camera? no, it is a one shot color camera..... i think stopping it down is the best path forward i think that is lateral chromatic aberration and if so stopping down the aperture will improve it. live and learn. Could you blur the other two channels to match the red or deconvolve the red to match the other two? i might try some of those ideas. I just did a quickie standard process on the data and posted it. didn't do much in the way of tricky things on it yet Rick -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
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ASTRO: Gamma Cygni region in RGB
Beautiful image Richard.
At least in the version you posted the halos around stars don't look bad, don't know if they were more prominent in the raw pictures. Stefan "Richard Crisp" schrieb im Newsbeitrag m... this was taken using a 6x7 format Pentax SMC 300mm f/4 lens with an FLI PL39000C one shot color camera. this is 39megapixels in RGB. total exposure was 11 x 15 minutes = 2h45m the stars have pretty bad haloes. I would imagine that is from the lens: there's a reason Pentax sold a very expensive APO lens in that same focal length/ratio http://www.narrowbandimaging.com/gam...pl39k_page.htm in the full resolution version, the sheer number of stars is staggering |
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