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M82 dual narrowband (wip)

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#1 meegja

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Posted 24 April 2021 - 07:07 AM

M82 is now perfect in the sky for me, so started that.
Started now with the Optolong L-eNhance filter, this is 4 hours of data with that. I want at least to gather 10 hours and then also a set of broadband captures and blend that in the end.
And due to the good position in the sky, I now pushed my mount to a new record: 600 sec exposures unguided smile.gif
 

Bortle 7/8
Meade LX200 8" f/10 ACF OTA
Ioptron CEM25EC montering (no guiding)
Optolong L-eNhance filter
Zwo ASI071MC Pro camera

 

Captured with SharpCap Pro @ -10 Celsius
25 x 600 sec / Gain 90 / Offset 4 / White balance R50 B50
30 darks/ 50 flats / 50 darkflats

 

Stacked with DeepSkyStacker

 

Processed in SiriL and Photoshop
Siril: Background Extraction and Histogram
Photoshop: Camera Raw Filter (blacks, saturation, clarity, noise reduction), size reduction to 1600px.

 

M82_4hours_eNhance.jpg


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#2 david.shadrach

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Posted 24 April 2021 - 07:11 AM

How an earth do you manage to get 600 seconds unguided. I get star trails at 30 seconds with my Nexstar Evo 8.

David



#3 meegja

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Posted 24 April 2021 - 07:21 AM

How an earth do you manage to get 600 seconds unguided. I get star trails at 30 seconds with my Nexstar Evo 8.

David

A mix of the encoders op the Ioptron CEM25EC mount, perfect polar alignment with the Ipolar polar alignment camera and my own experimenting.
If I use one of the normal tracking options of the mount, it will not track for this long. But I can give the sidereal tracking a user defined value (with 0,001 precision) and by keeping an eye on the RA movement of the stars, I can alter that. The biggest disadvantage: the value changes over time. So I have to keep an eye on it constantly. In my capture software SharpCap I zoom in 600x on 1 star and then use the "bulls eye" overlay and center on that star. When it starts to deviate in RA, I then alter the user defined sidereal racking. DEC has to be 99.9 % accurate though.


Edited by meegja, 24 April 2021 - 07:24 AM.

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#4 Scope2

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Posted 24 April 2021 - 08:01 AM

Nice solution for accurate tracking without guiding, Great results! Pat. 


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#5 meegja

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Posted 24 April 2021 - 11:54 AM

Nice solution for accurate tracking without guiding, Great results! Pat. 

Thanks!
And yes, I think it's an nice combination of old fashion working with new fashion methodes :) Guiding would be more "easy" but I like to fiddle this way.



#6 david.shadrach

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Posted 25 April 2021 - 04:36 AM

Great results but I fear a little beyond my capabilities.

 

David


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#7 meegja

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Posted 26 April 2021 - 03:51 PM

9 hours in now smile.gif
 

 

M82_9hours_eNhance.jpg


Edited by meegja, 26 April 2021 - 03:52 PM.



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