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Orion Nebula HDR in Red Light with the ZWO ASI174MM

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#1 james7ca

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Posted 08 November 2015 - 12:50 AM

Another relatively quick capture using the ZWO ASI174MM with a Tele Vue NP127is working with its 0.8X reducer (e.f.l. 528mm at f/4.2). This is an HDR composite using exposure times of 2 seconds, 8 seconds, and 32 seconds all in red light using a Baader RGB filter set. Total integration time was 41m 36s (48 x 32s, 96 x 8s, 96 x 2s) with about 20 darks at each exposure setting and 128 bias frames. This was a relatively quick pass at the processing, since I haven't yet finished the entire exposure series. I may even try adding some 0.5 second exposures to enhance the core of the nebula.

 

If the skies remain clear tonight I may be able to finish the entire RGB set with nearly twice the number of 32 second frames in each channel for the final composite (so, about one hour of integration time for each of the channels).

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  • Orion Nebula in Red Light.jpg


#2 xb39

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Posted 17 December 2015 - 04:34 AM

Hi James,

great work! What are your settings for e.g. gain? Which software are you using for imaging and processing?

Thanks for your answer!



#3 james7ca

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Posted 17 December 2015 - 05:19 AM

I use the Hi-gain setting in the ZWO ASCOM driver. Image capture done with Sequence Generator Pro and the image processing was done with PixInsight and Photoshop CC 2015.



#4 xb39

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Posted 17 December 2015 - 04:31 PM

Thanks for the info! So you didnĀ“t change the standard gain value of the driver?


Edited by xb39, 17 December 2015 - 04:34 PM.


#5 james7ca

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Posted 17 December 2015 - 06:35 PM

The ASCOM interface for the ASI174MM has an "H-gain" button and that is all I use to set the gain and offset/brightness. AFAIK, the H-gain setting uses unity gain which seems like a good place to start (you certainly don't need to go higher). I think ZWO even has some charts now that plot the read noise and other characteristics for each gain setting on the ASI174MM. These are available on their website.




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