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M51 the hard way.

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#1 scadvice

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Posted 17 June 2019 - 11:14 PM

Comedy of errors at the first dark site for the new scope. The club had its monthly high star party on the first and I brought my new setup. I’d never been to this site so the first thing I do wrong is set the TriPier up so far off I could not polar align. The scope is a Stellarvue 130T with a Access 80mm piggybacked on a CEM60 not something to just slide over into alignment and still be level. I’m not sure how I got it so far off…maybe a piece of magnetic metal near the compass.

 

I did a little visual for an hour thinking I won’t image tonight, checked a few views through some of the big Dob’s brought up an then the itch to image got too overwhelming at about 12:30am.

 

So I pulled the setup down (in the dark), corrected the pier alignment… leveled  and remounted the CEM60 and scopes. Polemastered it (gotta love that little toy), focused and sampled a couple of fast images of M51 and  hit PHD and started imaging...

 

PHD would not settle and lock in…

 

An hour later I gave up on PHD and guiding and set the imaging for 60 sec. at  a ISO of 1600 so I could capture unguided.  Like I said, gotta love PoleMaster.  I got about 100 images before the dawn light started. Lost 25 of those to spongy ground  and  5 to planes , satellites ect.

Did my darks and bias but only got  ten flats  because the  laptop battery died and I didn’t bring the backup.

 

(Later realized I had not plugged the guider into a powered port that was why the guider and PHD were not working .  So stupid, I should have figured that out.)

 

 

All and all …not a bad night….bombdrop.gif

 

 

Stellarvue SVA130T
70 x  60sec
ISO 1600
DSLR T3i Modified
PixInsight and Gimp

CEM60

Unguided

SGM 20.63

Attached Thumbnails

  • m51gimprs.jpg

Edited by scadvice, 17 June 2019 - 11:40 PM.

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#2 Dynan

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Posted 17 June 2019 - 11:28 PM

And...with a 'very-familiar-to-all-astronomers-comedy-of-errors' you produce a beautiful image!

 

Got some banding issues, I think. Did you dither? Try CosmeticCorrection?

 

Still, nice image considering all you went through. You get the 'Tenacity Trophy' for today!



#3 scadvice

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Posted 17 June 2019 - 11:58 PM

unguided - couldn't dither. Well I didn't think I could...I'll have to check the manual...

 

I'll try CosmeticCorrection Thanks for the tip.


Edited by scadvice, 18 June 2019 - 12:00 AM.


#4 Stelios

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Posted 18 June 2019 - 01:28 AM

Not bad at all for unguided! I think you raised the black point too much and got rid of some nebulosity along the way. 



#5 ChrisWhite

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Posted 18 June 2019 - 06:17 AM

With enough subs you don't need to toss images with satellites and planes. Just let the rejection algorithm remove the offending trails.
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