Jump to content

  •  

CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.

Photo

Solar Imaging with a 14" Newtonian - Dobson.

Imaging Reflector Dob
  • Please log in to reply
4 replies to this topic

#1 Mikehuerto

Mikehuerto

    Mariner 2

  • -----
  • topic starter
  • Posts: 215
  • Joined: 30 Aug 2020
  • Loc: Valencia, Spain

Posted 27 May 2022 - 01:21 PM

I am new to solar imaging and fairly new to astronomy. About 2 years ago, I bought my first and only telescope. A used SW 14" GOTO Dobson. I am amazed at the versatility of the instrument. It's great for visual, and also does very well for planetary, comets and DSO imaging, including mag 8 nebula (https://www.astrobin...ers/MikeHuerto/) . So I naturally, wanted to see if I could complete the circuit with some solar imaging. I wanted to keep it cheap and simple. I was concerned with overheating and melting the secondary etc etc. So I first opted to make a 100 mm off axis filter using Baader Astrosolar OD 5. I made a solar-finder using a toilet-paper tube and tape. 

 

I took it for a test drive today. I used Sharpcap to capture 2000-10,000 frames per session.  Absolutely no problems with overheating. The tube and secondary stayed at about 35 C (close to the ambient temp today in Spain!). 

 

 

Here's a stack from one of them, and a screen shot from the full screen view

 

I've also included some pics of the set-up. Still need to improve focus, use flats, and experiment more with this set-up. Will test some  Baader OD 3.8, also at 100 mm diameter, and then step by step try larger and large filters. 

 

Region 3023 @ 12:54 UTC +2, May 27th

Capture area 488 x 488

Color space RAW8

FPS 100

Gain 20

Exposure 1.4 ms

Frames:10,000

Stacked in AS 5,000

Time zone UCT +2

Sharpened in Registax. 

Color conversion (duotone) in Photoshop

 

Screen shot with 3023 and 3024 below it  (not stacked)

Capture area 1304 X 976

FPS 27

Gain 20

Exposure 1.4s

 

 

So, yes, I know that a large Newtonian is not the ideal instrument for solar imaging, but I'm just on a bit of mission to use this scope for as many targets as possible - and avoid accumulating a garage full of toys!

 

CS

 

Mike

 

EDIT: Forgo to mention, the camera was the ASI224MC - so not even an MM camera!

Attached Thumbnails

  • 2022-05-27-1254_6__lapl5_ap18- 3023 PS.jpg
  • CaptureSUN3023-3024 spots.jpeg
  • Dobson and filter .jpeg

Edited by Mikehuerto, 27 May 2022 - 02:42 PM.

  • Ljubo, happylimpet, roelb and 4 others like this

#2 jrschmidt2

jrschmidt2

    Vostok 1

  • *****
  • Posts: 183
  • Joined: 30 Jul 2020
  • Loc: Fitchburg, WI

Posted 27 May 2022 - 01:48 PM

So that is 3500mm of aperture stopped down to 100mm?  I love it!


  • Mikehuerto likes this

#3 photoracer18

photoracer18

    Aurora

  • *****
  • Posts: 4,950
  • Joined: 02 Sep 2013
  • Loc: Martinsburg, WV

Posted 27 May 2022 - 02:16 PM

Delete a zero from that number.


  • Mikehuerto likes this

#4 Mikehuerto

Mikehuerto

    Mariner 2

  • -----
  • topic starter
  • Posts: 215
  • Joined: 30 Aug 2020
  • Loc: Valencia, Spain

Posted 27 May 2022 - 02:17 PM

So that is 3500mm of aperture stopped down to 100mm?  I love it!

Thanks - but I think its  actually 355 mm to 100 mm (3500 would be nice!)



#5 jrschmidt2

jrschmidt2

    Vostok 1

  • *****
  • Posts: 183
  • Joined: 30 Jul 2020
  • Loc: Fitchburg, WI

Posted 27 May 2022 - 02:53 PM

My mistkae!  I guess you don't have a home-brew Hubble there, do you ;-)




CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.


Recent Topics





Also tagged with one or more of these keywords: Imaging, Reflector, Dob



Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics