I have had very good luck with the nitrile . Readily evadable . Â best regards, Â Jim Miller ... From: " nakbrooks " < ukzxcvb @yahoo.co. uk > To:...
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Jeff Armstrong
army5@att.net
May 15, 2013 9:54 pm
The Whirlpool Galaxy (also known as Messier 51a, M51a, or NGC 5194) is an interacting grand-design spiral galaxy in the constellation Canes Venatici. The...
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Bernard Miller
bgmiller_01
May 16, 2013 3:27 pm
Jeff, Very nice detail. On my monitor it looks like there is a green tint to the image. You may want to try the HLVG filter. ...
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Stan
stan_ccd
May 17, 2013 2:53 pm
... You don't have to rely on appearance to determine color hues. Measure the color ADU differentials. A CCDStack measurement of an area near the satellite...
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Bob Franke
bob_franke
May 17, 2013 6:20 pm
Using six SDSS-DR7 stars, eXcalibrator gives an RGB correction of 1.00, 0.99 and 1.07. This adjustment sets the area, that Stan mentioned, very close to a...
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Bernard Miller
bgmiller_01
May 21, 2013 3:31 am
Hi, Here is an image of NGC3718 and its companion NGC3729. These two galaxies orbit each other with a separation of about 147,000 light years. These two ...
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Ron Brant
astroron2001
May 21, 2013 3:50 am
Nice detail Bernard! Ron ... From: Bernard Miller To: ccd-newastro@yahoogroups.com Sent: Monday, May 20, 2013 7:50 PM Subject: [ccd-newastro] NGC3718 an d...
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waddington50
May 21, 2013 3:16 pm
Really nice result, Bernard. I like the way you brought out the faint extensions and the "bow wake" on the larger galaxy. I don't know what to say about the...
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Stan
stan_ccd
May 21, 2013 3:25 pm
... Very fine! ... That rendering is definitely blue deficient. But the reddening is probably due to interstellar dust so the imager must decide if the effects...
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Eric
eja24601
May 21, 2013 3:29 pm
Hi Bernard, I like your rendering, especially the dim tidal tails around 3718. I have some data of this from a few years' back, and I also recall having...
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dan kowall
dan_kowall
May 21, 2013 4:30 pm
Hi Stan, I have a question about "Instead, the galaxy itself can be used as the 'white point'...". I have heard from you and others in the imaging community...
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Matthew Dieterich
matt.dieterich
May 21, 2013 5:08 pm
Beautiful image Bernard! Very clean image and I love the background fuzzies =) Â Matthew Dieterich University of Pittsburgh: Geologic and Planetary Science...
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De Lorme Broussard
delorme_brou...
May 21, 2013 5:15 pm
Hi Bernard, Great pictures! De Lorme From: Matthew Dieterich <matt.dieterich@...> ... [Non-text portions of this message have been removed]...
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tpiccian
May 21, 2013 5:47 pm
I made the mistake of trying to use the white gloves sold by hobbiests and got lint all over my filters. Fortunately I also purchased a ccd electrostatic brush...
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Ron Wodaski
rwodaski
May 21, 2013 5:51 pm
Many galaxies have color profiles. Yep: some are redder (mostly older stars) and some are bluer (mostly new stars). No big surprise there; it makes total sense...
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stargazer66207
May 21, 2013 5:57 pm
Bernard, That is an absolutely STUNNING image! I love the detail you picked up in the distorted dust lane, as well as the gravitational streamers. Also, nice...
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Bob Runyan
runrob68876
May 21, 2013 7:47 pm
Hello Bernard: I'm in total agreement with everyone's comments and congratulations on an excellent result on a difficult target. I do notice little extra...
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Bob Franke
bob_franke
May 22, 2013 6:47 am
Hi Bernard, The NED data show that we have a very clear view of these galaxies. The foreground galactic extinction is almost non-existent. Also, with the...
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echesak@...
echesak...
May 22, 2013 2:55 pm
Hi Nigel, Congrats on the filters. After saving for a year, I bought a set of 3nm 50mm filters last year. The real pisser is that the we had the worst Winter...
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Stan
stan_ccd
May 22, 2013 3:14 pm
... It may be useful to distinguish "science" from "pretty pix". Science data is best acquired and analyzed per filter and those filters are not "R,G,B" but...
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Stan
stan_ccd
May 22, 2013 4:06 pm
(continued) ... However, there is "consensual color" and many practitioners spend considerable time trying to adhere to the basic guidelines. This allows...
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Bernard Miller
bgmiller_01
May 22, 2013 4:19 pm
Stan, Thanks for the tip. Sure enough when I tried your suggestion, out came the blue. I posted the new version at the same URL. I like the new version better,...
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Stan
stan_ccd
May 22, 2013 4:23 pm
... I like it! Stan...
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Bernard Miller
bgmiller_01
May 22, 2013 4:26 pm
Bob, In almost all my pictures I use eXcalibrator and I love it. But in this case I went with the blue because I really like blue in astro pics. Thanks for ...
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Jeff Armstrong
army5@att.net
May 22, 2013 5:57 pm
Stan, I appreciate your insight into this very 'touchy/sensitive' subject. I am not afraid to admit that at this time I am after pretty pix. At this time I...
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stargazer66207
May 22, 2013 6:15 pm
Bernard, Yes, I like the rework better, also. A wonderful image!!! Ron Abbott...
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dan kowall
dan_kowall
May 22, 2013 6:44 pm
Thanks for those links, Ron. All of my forays into reading professional research remind me of that old saying that goes something like "The more I know, the...
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dan kowall
dan_kowall
May 22, 2013 7:08 pm
Thanks for your thoughts, Stan. Your explanation certainly 'shines a light' on the difficulties and foolishness of chasing 'true color'. I'd still like to...
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Bob Franke
bob_franke
4:47 am
Hi Stan, I think you are right on the money. There is no way to tell if the colors in our astro photos are correct. We cannot directly view a deep sky object...
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eug_rider
6:05 pm
Not that anyone cares but here's my pretty picture [:)] Same objects shot in March of this year using a CDK 17, Apogee u16m and Astrodon filters. I used a...
