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M42 and Running Man from this past winter

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#1 Orion58

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Posted 09 October 2013 - 04:04 PM

Hello CNers

Gathered the data for this image last January.

Telescope: AT65EDQ
Focal ratio: f/6.5 (420mm)
Camera: modified Canon 500D
Exposure info: 19 x 150s, 67 x 180s, 112 x 210s @ ISO 800. Total exposure time 10h 40m. Dark, flats and bias frames also added. Note: 15 and 30 second exposures were taken for the core of the trapezium.
Date(s) taken: Jan 6, 9 & 14, 2013

A larger version can be accessed here: http://www.flickr.co...t58/8925133494/

As always comments and critiques are welcome and thank you for looking.

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#2 SKYGZR

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Posted 09 October 2013 - 04:09 PM

Nice Detail

#3 shrevestan

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Posted 09 October 2013 - 04:10 PM

Looks great!

#4 HeyJP

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Posted 09 October 2013 - 04:48 PM

Bruce,

Did you combine the 150, 180, and 210s exposures equally? Or use the 210s for the fainter out regions and 150 for the brighter, non-Trapezium areas? Or just pile it all together and carefully stretched?

Jim in Boulder

#5 srosenfraz

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Posted 09 October 2013 - 05:31 PM

Beautiful, Bruce - you have a serious amount of dust in this image, and I really like your color as well. Very nicely done!

#6 ok_wx_guy_24

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Posted 09 October 2013 - 05:55 PM

Excellent image Bruce! Just curious, but how were you able to pull out the dust details in this image? Is this something that your modded Canon 500D can pick up, or was it the longer exposures that you did, or both?

#7 mmalik

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Posted 09 October 2013 - 06:44 PM

Ton of integration; amazing result. Regards

#8 Stargazer78

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Posted 09 October 2013 - 07:50 PM

WOW!!!!! That is awesome!!!!! How did you combine the set?

#9 petemumbower

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Posted 09 October 2013 - 10:53 PM

Exceptional image! I really like the processing and dedication to so much intergration time.

#10 Orion58

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Posted 10 October 2013 - 10:17 AM

Thank you all very much for your comments - they are appreciated.

Perhaps I can answer the questions from Jim, ok wx guy 24 and Stargazer with this brief process description:

I stacked all the subs (150, 180 & 210 sec) at once in ImagesPlus 5.0 (along with the calibration frames of course). After stacking while still in IP I did a DDP stretch which included the "nth Root Xn" found in the HDR Pre Stretch Scale at the top of the DDP box. This is a fascinating tool as it enables you to aggressively stretch the fainter parts while not blowing out the stars. That is how I got the faint dust started. Following that, still in IP, I did some smoothing and star/halo reduction. At this point I transferred the image to Photoshop.

From here on I basically used our friend Scott's DSLR-LLRGB processing workflow that many of you are probably aware of:

http://www.astronome...gb_tutorial.php

And thanks again Scott for taking the time and effort to make this tutorial - great job.

When I finished processing the image I still had to combine the shorter (15 and 30 sec) subs of the trapezium. I had stacked these separately. I just did a simple brightening stretch focusing only on the trapezium area. When it reached a brightness that was comparable to the central area of the longer exposure image I put it as a layer on top of this "main" image. A hide all mask was used and I carefully painted the mask to allow just the trapezium area to show through. The mask was feathered heavily if I remember correctly.

To specifically answer ok wx guy 24's dust question: I used the screen mask invert technique (see Scott's tutorial) to pull the faint dust out. It is a very useful tool. The use of masking is essential when using this technique.

Thanks again for all your comments.

#11 mpgxsvcd

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Posted 10 October 2013 - 11:44 AM

That really is an outstanding image.

#12 Orion58

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Posted 11 October 2013 - 03:01 PM

Thanks Travis.

#13 Louietheflyisme

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Posted 11 October 2013 - 09:21 PM

Very nice image there Bruce!






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