Contains:IC 1275, NGC 6559, IC 1274, IC 4685, IC 4684, NGC 6530, M 8, Lagoon nebula, Hourglass nebula, NGC 6523, NGC 6526, The star 9Sgr, The star 7Sgr
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M8 from DSW data (please read my report below), 




    

        Marcus Wögerer
M8 from DSW data (please read my report below)

M8 from DSW data (please read my report below)

Technical card

Resolution: 4974x3741

Frames: 65x600"

Integration: 10.8 hours

Astrometry.net job: 1951680

RA center: 271.733 degrees

DEC center: -24.141 degrees

Pixel scale: 1.400 arcsec/pixel

Orientation: 359.725 degrees

Field radius: 1.210 degrees

Data source: Unknown

Description

After some discussions about DSW posts in forum here in AB, I got some data free of charge form Lloyd to process it.

Lloyd and I had a good discussion via PM and finally we did have quite a similar opinion in many aspects.

I would like to report you my emotions during working with DSW data.

First I got a link (RAW data with Takahaschi FSQ 106DEXIII) from Lloyd and he said "choose a picture and I send you a link to a dropbox".

Half an hour later I had 2 GB of finest RAW LRGB data of totally 10.8 hours integration time on my computer. Therefore I would need 2-3 day to capture with best weather conditions and without any mistake or error on my side.

The feeling was like shopping with a coupon. I decided to take M8. It is bright and I had similar data and have played already. So I knew already how the picture should look like.

I got original calibrated data, which I see an advantage to bring out the best, compared to already star aligned data.

The processing was much easier compared to my own RAW data, although ist the first time that I process real L-RGB data.

- Already RGB only showed a impressive result.
- Added Luminance data the S/N improved a lot.
- Additional I generated a Lum out of RGB data and mixed it 30% into the Lum data.(70%)
Maybe that makes no sense, but I did.

After registration all the RAW data I generated drizzle data and finally integrated with drizzle 2x2.
The 5.4µm Pixel (from CDD KAF 8300) do not cover the resolution of the Takahaschi FSQ 106DEXIII. I think the center resolution is much higher. Similar what I have seen on my SAMY135.

The final result of this posted AP is resized to 150% of original resolution of the CCD.
I have worked with some convolute and de-convolute strategies. I tried to increase the resolution in the bright areas, and slightly reduced the resolution in dark areas to keep noise moderate.

- I have NOT used any other noise rejection methods. For me this looks much more natural.
I hope you like it.
- I have NOT locally reduced brightness or contrast.
- I did NOT need to do any background extraction to remove gradients, or light fall off at edges.

This is the link to Lloyds processing:
https://www.astrobin.com/297607/B/?image_list_page=3&nc=&nce=

This is a link to a M8 with my equipment:
https://www.astrobin.com/297490/?image_list_page=2&nc=&nce=

I have enjoyed the processing, and I think I have learned a lot during working with such high quality RAW, but I still have NOT THE FELLING IT IS MY ASTROPHOTO.
OK, we can talk about the processing, but I have no remember of the event capture the RAW data. I miss that.

Rgds, Marcus

Comments

Author

Marcus1968
Marcus Wögerer
License: None (All rights reserved)
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Revisions

  • M8 from DSW data (please read my report below), 




    

        Marcus Wögerer
    Original
  • M8 from DSW data (please read my report below), 




    

        Marcus Wögerer
    B
  • M8 from DSW data (please read my report below), 




    

        Marcus Wögerer
    C
  • Final
    M8 from DSW data (please read my report below), 




    

        Marcus Wögerer
    D

B

same procedure, but 3x3 drizzle instead of 2x2 drizzle, resized to 150% of original CCD resolution

C

Version B, but with low amount of local Equalization

D

Final Version. Reduced brightness.

Sky plot

Sky plot

Histogram

M8 from DSW data (please read my report below), 




    

        Marcus Wögerer