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ASTRO: Rosette in Ha/O3 from 400mm lens and ML8300
here is one more from the Microline ML8300 and the Pentax 6x7 400mm f/4
ED(IF) lens I was planning to take a full set of sulfur, hydrogen and oxygen but the conditions deteriorated last night by the time i finished the oxygen data so I had to give up with only Ha and O3 in the can I managed to get 11 x 10 minutes of decent Ha shots and 10 x 10 minutes of decent [OIII]. the seeing was not so hot and got worse but the killer was the cloud cover that moved in just past midnight :-( anyway here is the Rosette in Ha / [OIII] It is sort of OK, maybe you will like it http://www.narrowbandimaging.com/inc...x10min_xga.jpg |
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ASTRO: Rosette in Ha/O3 from 400mm lens and ML8300
Richard Crisp wrote:
here is one more from the Microline ML8300 and the Pentax 6x7 400mm f/4 ED(IF) lens I was planning to take a full set of sulfur, hydrogen and oxygen but the conditions deteriorated last night by the time i finished the oxygen data so I had to give up with only Ha and O3 in the can I managed to get 11 x 10 minutes of decent Ha shots and 10 x 10 minutes of decent [OIII]. the seeing was not so hot and got worse but the killer was the cloud cover that moved in just past midnight :-( anyway here is the Rosette in Ha / [OIII] It is sort of OK, maybe you will like it http://www.narrowbandimaging.com/inc...x10min_xga.jpg Short focal length but small pixels makes a good combination. How was the color mapped? Red for Ha and OIII for green and a combination for blue? Just guessing 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: Rosette in Ha/O3 from 400mm lens and ML8300
"Richard Crisp" wrote in message
m... here is one more from the Microline ML8300 and the Pentax 6x7 400mm f/4 ED(IF) lens I was planning to take a full set of sulfur, hydrogen and oxygen but the conditions deteriorated last night by the time i finished the oxygen data so I had to give up with only Ha and O3 in the can I managed to get 11 x 10 minutes of decent Ha shots and 10 x 10 minutes of decent [OIII]. the seeing was not so hot and got worse but the killer was the cloud cover that moved in just past midnight :-( anyway here is the Rosette in Ha / [OIII] It is sort of OK, maybe you will like it http://www.narrowbandimaging.com/inc...x10min_xga.jpg How could anyone not like that? Nice. George |
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ASTRO: Rosette in Ha/O3 from 400mm lens and ML8300
Beautiful image Richard
Kev "Richard Crisp" wrote in message m... here is one more from the Microline ML8300 and the Pentax 6x7 400mm f/4 ED(IF) lens I was planning to take a full set of sulfur, hydrogen and oxygen but the conditions deteriorated last night by the time i finished the oxygen data so I had to give up with only Ha and O3 in the can I managed to get 11 x 10 minutes of decent Ha shots and 10 x 10 minutes of decent [OIII]. the seeing was not so hot and got worse but the killer was the cloud cover that moved in just past midnight :-( anyway here is the Rosette in Ha / [OIII] It is sort of OK, maybe you will like it http://www.narrowbandimaging.com/inc...x10min_xga.jpg |
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ASTRO: Rosette in Ha/O3 from 400mm lens and ML8300
"Rick Johnson" wrote in message . com... http://www.narrowbandimaging.com/inc...x10min_xga.jpg Short focal length but small pixels makes a good combination. How was the color mapped? Red for Ha and OIII for green and a combination for blue? Just guessing I am really liking how those 5.4 micron pixels of the KAF8300 as deployed in the FLI Microline ML8300 are performing when used with that 400mm pentax ED lens as for your question on the color mapping, yes good guess: details here, see page 18 http://www.narrowbandimaging.com/inc..._sky_flats.pdf this is just applying physics to the problem: when you have ionized hydrogen you get Halpha and Hbeta and Hgamma and Hdelta etc.... the Alpha and Beta lines are visible and occur in a strict ratio set by quantum mechanical state transition probabilities: the transition leading to Halpha occurs with 2.92 times the probability of the Beta transition. So I add the "hbeta" line to the [OIII] to make a blue channel. the [OIII] doublet straddles the Green/Blue region so that's why the [OIII] is added to the blue as well. here is a bit more on that technique of deconstructing and reassembling emission nebulae apply simple physics principles http://www.narrowbandimaging.com/synthetic_rgb_page.htm |
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ASTRO: Rosette in Ha/O3 from 400mm lens and ML8300
Nice one Richard, enough data for the Ha:OIII:OIII. I am too lazy to take
three narrow band channels anyway, so I like this approach even if was forced by the weather. Stefan "Richard Crisp" schrieb im Newsbeitrag m... here is one more from the Microline ML8300 and the Pentax 6x7 400mm f/4 ED(IF) lens I was planning to take a full set of sulfur, hydrogen and oxygen but the conditions deteriorated last night by the time i finished the oxygen data so I had to give up with only Ha and O3 in the can I managed to get 11 x 10 minutes of decent Ha shots and 10 x 10 minutes of decent [OIII]. the seeing was not so hot and got worse but the killer was the cloud cover that moved in just past midnight :-( anyway here is the Rosette in Ha / [OIII] It is sort of OK, maybe you will like it http://www.narrowbandimaging.com/inc...x10min_xga.jpg |
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