RE: [ap-gto] New Image Issues: The Flame Nebula


Dec 3, 2016

 


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#73815 Dec 3, 2016

Guys,  Thanks for the replies. Let me address them now.  Don, that.s what is am leaning towards but am at loss as to how to subdue the effect, keep in mind seldom do I image with such a bright star in the field so it is likely a moot point. Unless there is an easy fix.  Stuart, I.ll have to see if I can measure this as well. One thing that I didn.t say and should have is I use a STL-11002M CCD camera with Baader 50mm filters. The camera has the FW8 instead of the built-in 5 filter wheel so it replaced the original front plate and filter wheel. Spacing is critical between the CCD chip and the flattener so I have no leeway there at all. As it is installed I have the camera/MMOAG/Flattener/Pyxis 3. Rotator and rear cell. The only other time I.ve seen issues is if there is a very bright star just off the chip and then sometimes it makes a difference if the mount flips being that east side may show some issue while the west side might not at all. Same with those reflections I showed a crop of for the Medusa Ha image here.  Mike, as seen in the Medusa Ha image I don.t have that issue, for that matter in most of the images. Alnitak of course is extremely bright and very rarely would I have. a star of such brightness in the field. The only issue I have seen in some of my Ha images that are taken under less than good conditions is a horizontal like dark area above the center of the top of the image. Maybe 5-7% down from the top. On well exposed images under good conditions it isn.t an issue so it really isn.t a problems as those frames would not have been used anyway. As far as filter placement, I have no choice.  Kent, thanks for the heads up but all my filters are 50mm unmounted so that would apply but thanks for the notice. In my early days of imaging I used the Custom Scientific that SBIG shipped with their filter wheels for both my ST-7 and ST-8. When I moved up to the ST-10XME I had some issues with the CS filters over time and replaced them with Astro Don version 1. Those gave me reflection issues and I moved on to Baader which I have had for a long time now. That was before the Astro Don filters came out with version 2. When it came to the STL-11002M I ended up staying with Baader filters and have been mostly happy. If I were to need new filters I.d look as Astro Don filters again.  Again, thanks for the replies and suggestions.  Steve  From: ap-gto@yahoogroups.com [mailto:ap-gto@yahoogroups.com] Sent: Saturday, December 3, 2016 2:31 PMTo: ap-gto@yahoogroups.com; ap-ug@yahoogroups.comSubject: Re: [ap-gto] New Image Issues: The Flame Nebula


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