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EAA with a manual Dobson... it´s working!

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#101 SonDob

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Posted 01 March 2019 - 02:47 PM

Ok Ill read into the differences and try out. Thank you

#102 descott12

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Posted 01 March 2019 - 03:55 PM

Here is an example M42/NGC1977 with and without flats. I posted these in another thread but couldn't quite remember where...

Anyway the "without flat" image looks alot like yours with a bright circle in the center.

 

It did occur to me that you might have a bit of trouble getting this to work without automatic tracking but it would be an interesting experiment.

 

Note: I had to shrink and resize these image to upload. The vignette effect was actually quite a bit more noticeable on screen.

 

EDIT: I forgot to include the exposure settings. Both shots were 1 minute stacks with a 5 second exposure using my Evo 8 + Hyperstar + ASI 294 MC

Attached Thumbnails

  • M42-withflat.png
  • M42-withoutflat.png

Edited by descott12, 01 March 2019 - 06:14 PM.


#103 SonDob

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Posted 01 March 2019 - 04:54 PM

Thank you for the example. I agree it looks very similar. Ill try it out. Also the camera can compensate vignetting but i never enabled that function before. Ill try both out

#104 Ubuntu

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Posted 07 March 2019 - 02:13 PM

NGC2207, 2 galaxies in interaction: 173 frames, total 87s

Stack_173frames_87s_WithDisplayStretch V2.jpg

 

NGC4762, paper-kite galaxy: 183 frames, total 92s

Stack_183frames_92s_WithDisplayStretch V2.jpg

 

NGC4535, The lost galaxy of Copeland: 304 frames, total 152s

Stack_304frames_152s_WithDisplayStretch V2.jpg

 

M49: 105 frames, total 53s

Stack_105frames_53s_WithDisplayStretch V2.jpg

 

M86, M84, NGC4402: 172 frames, total 86s

Stack_172frames_86s_WithDisplayStretch V2.jpg

 

M99: 184 frames, total 92s

Stack_184frames_92s_WithDisplayStretch V2.jpg

 

M91: 225 frames, total 113s

Stack_225frames_113s_WithDisplayStretch V2.jpg

 

 


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#105 Ubuntu

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Posted 11 March 2019 - 01:58 PM

ARP 321: 94 frames, total 47s  Sharpcap pro 3.2

Stack_94frames_47s_WithDisplayStretch V2.jpg

 

M13: 23 frames, total 6s

Stack_23frames_6s_WithDisplayStretch V2.jpg

 

Centaurus A, hamburger galaxy: 70 frames, total 70s

Stack_70frames_70s_WithDisplayStretch V2.jpg


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#106 SonDob

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Posted 08 April 2019 - 06:20 AM

some new pictures. Again with the 8"/1200mm manual Dobson. This time I played around with more magnification at slow native ~f/6. Of course I need longer integration times. So all pictures are were covered with a lot of drifts. All single frames are captured with 0.64sec. All captured with sharpcap using histogram stretch, only. Did not use dark frames, yet.

 

Eskimo Nebula in b/w 35sec

 

Stack_718frames_35s_WithDisplayStretch.png

 

and in color 9s

Stack_192frames_9s_WithDisplayStretch.jpg

 

 

NGC3628 in Leo 143sec

Stack_876frames_143s_WithDisplayStretch.png


Edited by SonDob, 08 April 2019 - 06:29 AM.


#107 SonDob

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Posted 08 April 2019 - 06:27 AM

M66 in Leo 159sec

Stack_2396frames_159s_WithDisplayStretch.jpg

 

M65 in Leo 152sec

Stack_932frames_152s_WithDisplayStretch.png

 

NGC4567 and NGC4568, b/w 165s

Stack_973frames_165s_WithDisplayStretch.png

 

 

 

and the highlight of the night:

 

Jet in M87, b/w 100sec

Stack_32bits_622frames_100s.jpg

 

 

 

 

 


Edited by SonDob, 08 April 2019 - 06:32 AM.

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#108 Ubuntu

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Posted 02 May 2019 - 05:43 AM

Little session yesterday with the Dobson XT10 and the Risingtech IMX385.

 

Sharpcap 3.2, gain: 5000, save as seen, no darks, no flats

 

M100: 104 frames, total 52s in B&W for more details... in color I could not bet the supernova clearly:

Stack_104frames_52s_M100.jpg

 

And here is the SN:

Stack_104frames_52s_M100 CropSN.jpg

 

NGC 4302 : 88 frames, total 44s

Stack_88frames_44s_NGC4302.jpg

 

M57: 55 frames, total 7s, I worked with 125ms exposures

Stack_55frames_7s_M57.jpg


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#109 Ubuntu

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Posted 04 May 2019 - 02:53 PM

Little session yesterday night dedicated to the south at the beginning of the night... with the Dobson in horizontal position for Omega Centauri... :D

 

M83, Southern Pinwheel galaxy: 62 frames, total 31s
Stack_62frames_31s_M83.jpg

 

Centaurus A: 74 frames, total 74s
Stack_74frames_74s_Centaurus A.jpg

 

Omega Centauri: 8 frames, total 4s
Stack_8frames_4s_Omega Centauri.jpg

 

NGC 4038, Antennae: 172 frames, total 86s, difficult to get the antennas...
Stack_172frames_86s_NGC4038 Antennae.jpg

 

 

NGC 4027 - ARP 22: 59 frames, total 30s
Stack_59frames_30s_NGC4027 - ARP22.jpg

 

 

NGC 4449 - C21: 106 frames, total 53s

Stack_106frames_53s_NGC4449 - C21.jpg


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