Hi Richard and Ed, I found the problem. The most important information I gained was when both of you hadn't seen what I was describing. That got me looking...
good news Richard i've seen similar things with faint images and quality filters. As you have realised the background is severely reduced and that permits the...
My Schuler Ha 10nm filter looks visibly red when looking at either surface. I notice on other filters like some of my Baaders including the Baader Ha 7nm...
Hi, the price for currently available LRGB filter sets is all over the place. Does anyone have a LRGB set manufacturer recommendation based on their...
i use optec with great success i have also used the FLI custom ones too with great success i'd not worry about exposure time balancing: it doesn;t really work...
Hi Richard, thanks for the reply. I am wondering if it would be better color scientific imaging using narrow band filters instead of buying a set of LRGB...
... of ... depends on what you want to do if you care about star colors they will not be right using emission line filters. you will need broadband color...
Hi Richard, thanks for the fast reply. I had already seen your webpage (very impressive), that's why I asked my question about using narrow band filters...
... using ... used ... all ... intense ... I agree that Ha can show a lot in some galaxies: those with HII regions. But ellipticals don't have much HII...
Hi Richard, "if the galaxy is too far away then the redshift will affect the ability of the filter to extract the proper line" Have you just invented a new...
... speedometer", a ... the ... and ... Interesting thought it is easier to simply take a spectrogram and measure the redshifts. if you want a tunable filter...
Hi, over the last few days I have been searching astro-imaging sites and doing internet searches looking for recommendations on filter manufacture, quality,...
Hi all, This is a strange message board. My post has received no public replies, but I received two private emails that contained information that would be...
... of ... I thought I posted my reply twice. did you not get one from me? It was my intent to publicly post. What happened? ... hardware ... the ... and ... ...
... of ... of ... I tried posting twice but it hasn't appeared. But anyhow I will try again: there is more to filter characterization than a simple scan. In...
Hi I saw a nice reference for different RGB filters, see: http://www.astrodon.com/oldsite/Color%20Filters.html I like the idea of using the fundamental...
Hi Richard, yes, one of the emails was from you. I suspect that you replied using the email you received and it went to me instead of the group. I should have...
... providing ... Hbeta is a significant emission line. if you are looking at galactic extinction it is invaluable: the reason is that it naturally occurs in a...
Thanks Richard, I still have a lot to learn. You made the comment that there is a problem using narrowband filters for RGB making the star colors look right....
As many of you know the Dawn mission is getting ready to launch to head to the asteroids Vesta and Ceres (dawn.jpl.nasa.gov). Fortunately, Vesta is a fairly...
I took a widefield image of the area surrounding IC1396 recently and made two different color images. One was a traditional tricolor emission line image using...
I just saw a reference in Ron Wodaski's "The New CCD Astronomy" where he uses a Continuum filter to completely remove stars from a narrowband image. IMO that's...
that's a commonly used technique employed by professional astronomers studying nebulae. all the more reason to use narrower filters: the nebula is what is ...
Hi, here you can find last shot with atik 16 hr ... http://www.lonnic.com/astro/ngc6888.2007.06.11.html Nico http://www.Lonnic.com/astro/ Orion ED 80, Intes...
Hi Richard, thanks for the example. Why do you think that the Continuum filter image doesn't quite scale to the Ha filter image, there is a 1/2 star offset at...
... because ... i think you are misinterpreting what you see. the issue is that you do not want to let the stars saturate. if they saturate then you will have...
Hi Richard, Ron's book only touched on the subject of continuum filters. Everything is simple in hindsight, once experienced. For me, earning a subject by...
Hi, I am becoming very interest in the application of the continuum filter to enhance observation of subtle astro detail. A reference on green continuum filter...
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