IC1275 withMN190

[Ken]

Hi all making the most of these clear skies, imaged this over several nights in Sagittarius with QhY9 camera and Orion mN190 on EQ6 mount.
Ha for Lum. 4 hrs
red1.8 hrs
green 1.5 hrs
blue 1.8 hrs
Not sure why the halos around bright stars with the Ha filter not sure if it is a reflection or leakage through the filter ?
Clear skies Ken

[multiweb (Marc)]

Very nice framing & details. I also love the color blending you did. Top work.

[Hagar (Doug)]

Very nice Ken, I just shot the same area in RGB. Interesting area with lots to look at.

Well done.

[Ken]

Thanks Marc and Doug, this area looks like a extension of m8 plenty of interesting objects.
Clear skies Ken

[David Fitz-Henr]

Nice image Ken, great colour work !

Originally Posted by Ken

Not sure why the halos around bright stars with the Ha filter not sure if it is a reflection or leakage through the filter ?

Could be a series of double internal reflections from the thick Maksutov corrector. The radii of the corrector are concentric, and given the specific wavelength of Ha, you might expect a series of evenly spaced concentric rings with sharp boundaries - which is what we are seeing (look at the brightest star - 3 concentric rings evenly spaced). Another factor may be that anti-reflection coating is not as effective toward the end of the spectrum ?

[Ken]

Thanks David for your thoughts on the reflections, I also get them with my newtonian and former Qhy8 camera and have tried 2 different Ha filters. Currently using 13nm Astranomik , might try moving the filter from the filter wheel to the nose adaptor.
Clear skies Ken

[Octane (Humayun)]

Ken,

Reflections, or, not -- that is a superb image. Beautiful colouring.

Well done.

Regards,
Humayun

[dcalleja]

Its a really interesting area. Not seen this imaged before. Thanks and BTW its well done

[Ken]

Thank,s Dan & Humayun
Clear Skies I wish ken

[gregbradley]

Nice shot Ken.

Tracking down reflections can be tricky. Most I have seen come from reflections off the filter and back from a reducer or flattener.

Were you using a flattener or reducer?

Greg.

[sjastro]

Very interesting image Ken.

Steven

[Moon (James)]

Ken
Nice image - it's great to see some NM images posted every now and then.
James

[Ken]

Thanks James & Steven I haven't seen any other 190 MN images on this site guess not many around , surprising considering the price and flat field at F5.3 with no other correctors needed. Thanks Greg no flattener or corrector used in the MN but I do use a coma corrector on my Newtonian both seem to have the same Ha halos. Interesting when using my previous QHY8 one shot colour the Ha stars were red with blue halos the only blue in a red image. The optical window in front of the ccd sensor may have a blue anti reflection coating with the mirror like coating on the Ha filter causing light to bounce around between them.
clear skies Ken

[atalas]

Ken,sorry I missed this one of yours,very nice work too!well done.

[Ken]

Thanks Louie posted this a while back, so many good images posted on iis lately.
clear skies Ken