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Rosette Nebula: Chroma 5nm Ha: TS Photoline 130 f/7

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#1 John Miele

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Posted 06 April 2020 - 08:40 PM

It has been partly clear the last two nights here in North Alabama with some scattered clouds and haze that came and went, but I really really wanted to keep working with the new replacement lens on my TS 130 f/7 so I set up the rig in my backyard redzone and got ready. The Moon was nearing full so I figured a narrow band image would be best. I only have one narrow band filter right now. It's a Chroma 5nm Ha. It's like a magic trick! When the first sub popped up I could not believe how much detail was getting pulled out of such a bright sky!

 

This is a stack of 52 x 5 minute subs using my ASI1600mm pro at unity gain. I pushed the stretching rather hard. Maybe a little too much, as there is some noise. But I really wanted to get all the dark dusty areas to show up.

 

I was using the TSFLAT3 1.0x flattener that I bought with the scope and I think it is doing a great job on the corner stars. This is the full image cropped just a little to get rid of the stacking artifacts and resized for posting. I am curious if anyone notices some very faint horizontal banding in the bottom left. I'm not sure if I'm imagining it or if there is some there? I would alsolike to know if I perhaps made the dark dust blobs too black. They almost appear a bit artificial to my eye...I did use flats and darks for calibration. C&C are most welcome!

 

Maybe could have used a little less focal length on this target too...lol!

 

Thanks for looking and cs!

 

John

Attached Thumbnails

  • NGC2237_Rosette_stackedA.jpg

Edited by John Miele, 06 April 2020 - 08:55 PM.

  • psandelle, eros312, 17.5Dob and 8 others like this

#2 ZL4PLM

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Posted 06 April 2020 - 08:47 PM

nice image - same scope here been so bad here weather wise hardly done anything with it :(

 

yes I see that banding ... its fairly faint but looks to be ... did you see anything on the subs or cal frames??



#3 richorn

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Posted 06 April 2020 - 08:47 PM

Looks great for 4 hours!

 

I do see a bit of banding...  Also, are the small stars trailing a tiny bit?  Tiny bit as in I had to use 2 different pairs of glasses lol



#4 John Miele

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Posted 06 April 2020 - 08:53 PM

I don't see much trailing but I'm stumped by the banding. I don't think I have ever had that on any image before. but this is really only my 2nd narrow band image. I'll take a  re-look at the flats and darks...



#5 AstroBrett

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Posted 06 April 2020 - 09:04 PM

Nevertheless, it is a really nice image John, particularly this close to full moon.  I'm struggling with getting useable data right now.  Keep up the good work.

 

Brett



#6 Astrola72

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Posted 06 April 2020 - 09:11 PM

Very nice John. Glad to see you're in action with the TS130 - finally! As for the (very slight) "banding" - did you look carefully at both surfaces of the filter? Might be something on the surface.

 

Joe



#7 sunnyday

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Posted 06 April 2020 - 09:17 PM

very pretty, I like black and white the detail is very different. Thank you and Bavo.



#8 Readerp

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Posted 06 April 2020 - 10:29 PM

The detail is incredible! Beauty.



#9 John Miele

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Posted 07 April 2020 - 06:35 AM

Very nice John. Glad to see you're in action with the TS130 - finally! As for the (very slight) "banding" - did you look carefully at both surfaces of the filter? Might be something on the surface.

 

Joe

Hi Joe,

 

When I installed the filter last month, I did look at both sides to make sure the coatings were clean and I did not notice anything funny. I'm suspecting my flats and plan to look a them more closely sometime today...




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