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M51 and M66 with ASI 120MM

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#1 Campos

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Posted 02 May 2016 - 04:09 AM

Hi guys,

 

This was my fisrt time using the little ASI 120MM for deep sky stuff, inspired by Emil Kraikaamp's work with "lucky imaging" I decided to give it a go from my urban back yard with the 300mm newtonian and EQ6, these are M51 and M66 galaxies shoot with 5 sec. subs with no filters at all:

 

M51, 268x5 secs:

 

https://www.flickr.c...eposted-public/

 

M66, 145x5 secs:

 

https://www.flickr.c...eposted-public/

 

 

Never mind the dirty background, it needs a lot more frames to clean it, but the details on the galaxies really shocked me :O

 

I think one of the newer generation cameras with very low read noise and lower banding would be really nice for this type of imaging!

 

Cheers,



#2 Merk

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Posted 02 May 2016 - 06:06 AM

Very nice it seems that the ccd astrophotography is changing.



#3 space_eagle28

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Posted 02 May 2016 - 10:32 AM

Very nice detail in both of them Luis. One more proof that CCD's and DSLR's are not the only way for DS imaging. Well done. :waytogo:



#4 rigel123

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Posted 02 May 2016 - 11:50 AM

Wow, that's interesting!



#5 hytham

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Posted 02 May 2016 - 09:37 PM

That M51 looks absolutely amazing. Are you dithering between subs or "X" number of subs?



#6 bilgebay

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Posted 03 May 2016 - 03:08 AM

Wow! Amazing details!



#7 Campos

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Posted 03 May 2016 - 03:37 AM

Many thanks all for the kind words :)

 

Yes, indeed I was quite shocked with the resolution acheived with this system! It's a pity that my poor EQ6 has a wild P.E. and it's a challenge to get longer unguided subs with the ASI 120 and the >20kgs 300mm ota....I must try this again with my 200mm f/4.6 newt. :)

 

Also this got me thinking on cooling this little ASI 120MM, compared with a DSLR it's a walk in the park, I should be doing this as soon as I can, and go for a bit longer subs (not by much or the lucky imaging stops beeing lucky...) but it should give me cleaner data to play with, some of the smaller planetary nebulas should be great with this sort of imaging, also in LRGB and a couple thousand subs to clean up that back ground noise!

 

It's too bad that the ASI 120MM has quite a bit of vertical banding but some sofwares take care of that to some extent, also I must try and find out how to do a full callibration with IRIS for the ASI 12o tiff files, I'm not sure how to subtract the bias...this should help further with noise levels, I did use on these two sets the automatic dark frame subtraction under Firecapture (excellent planetary capture freeware) but I'm not sure if it handles the bias from the darks or...?

 

Anyways...this is cool stuff indeed, so simple toget good resolution images (the main goal here is resolution) and yet so effective...me likes a lot! :)

 

Cheers,     


Edited by Campos, 03 May 2016 - 03:37 AM.


#8 Campos

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Posted 03 May 2016 - 03:39 AM

I forgot to add that unguided makes for a "natural" dither so no need to complicate ;)



#9 calypsob

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Posted 04 May 2016 - 01:02 PM

Excellent job Lewis!  I tried last night but I was having a lot of technical trouble  and I had to go to bed at midnight because of work the next day oh well try again tomorrow I suppose .    Glad to see that you successfully executed lucky imaging with this camera. I wonder how long of an exposure can be made before it is no longer considered a lucky imaging. Also for your bias frames I think you could just cover the telescope and take exposures at the fastest shutter speed  and to calibrate them into your flat frames, it might work.  Then again you could just take darks without using fire captures integration process .


Edited by calypsob, 04 May 2016 - 01:04 PM.


#10 Moey

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Posted 25 May 2016 - 02:22 AM

This is just incredible. I think i'm going to have to get me one of these and try it out with my 14.5" dob from my light polluted yard :)

 

Keep em coming!



#11 Mark Sibole

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Posted 25 May 2016 - 08:02 AM

Nice job.This makes life a lot easier for them mounts that are not tamed.Ive seen things like this done in the past with the Meade DSI 2 and Envisage set to auto dark subtract and stack on the fly.Many were getting nice results on 4 to 6 second sub frames and stacking a load of them.



#12 FirstC8

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Posted 25 May 2016 - 11:14 AM

This is definitely a good way to avoid guiding issue and fight seeing.

Just keep in mind though as good the details can be, it is not a breakthrough compared to long exposures with good guiding, especially when narrowband comes to play. You do need large aperture and more cumbersome scopes/platforms/storage/computing power, so the amount of effort is not much less, just different.

Edited by FirstC8, 25 May 2016 - 11:16 AM.


#13 EdwardMH

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Posted 28 May 2016 - 09:58 PM

Jaw dropping images keep them coming.



#14 CharlesW

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Posted 29 May 2016 - 10:27 AM

I'm sorry I didn't see this sooner. Simply amazing.



#15 epsilon160

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Posted 29 May 2016 - 11:15 AM

Great work! You inspire me to take some time in my planetary pursuits to point my 120MC at a dso and try it out. Thanks!



#16 chrysalis

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Posted 29 May 2016 - 03:32 PM

Great pictures! Once upon a time a long time ago we could only dream of taking pictures like these...



#17 Campos

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Posted 30 May 2016 - 03:31 AM

Many thanks all for the kind words :)

 

Much appreciated!

 

Cheers,



#18 GA-HAMAL

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Posted 30 May 2016 - 12:07 PM

Nice work :smile:
 

It's too bad that the ASI 120MM has quite a bit of vertical banding ...


recommend

http://www.cloudynig...-mod/?p=7210111

#19 Campos

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Posted 31 May 2016 - 03:46 AM

Nice work :smile:
 


recommend

http://www.cloudynig...-mod/?p=7210111

 

Hi Hamal,

 

Thanks, cool stuff) Hi didn't know AS2! had a vertical / horizontal banding routine :p Must check that out for sure.

 

Your M51 is astonishing!




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