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

First light with ZWO ASI-183

  • Please log in to reply
10 replies to this topic

#1 andysea

andysea

    Gemini

  • *****
  • topic starter
  • Posts: 3053
  • Joined: 03 Sep 2010
  • Loc: Seattle, WA

Posted 23 February 2018 - 10:14 AM

Here is my first attempt at using this camera.

104x120s L, 30x120s RGB. All done at gain 53. 

The luminance was done during a very hazy night hence the halos around the bright stars.

 

I will experiment with different gain settings as there is some banding, even tho I dithered every 4th frame.

Please note that the image is reduced by 40%. I usually don't post full resolution files.

 

https://www.flickr.c...341865/sizes/o/


Edited by andysea, 23 February 2018 - 10:15 AM.

  • Stelios, rwstanley, DaveB and 13 others like this

#2 BenKolt

BenKolt

    Apollo

  • -----
  • Posts: 1250
  • Joined: 13 Mar 2013

Posted 23 February 2018 - 11:30 AM

Great first light, Andy, and congratulations!

 

Could you please remind me what scope you are using with that camera?  Thanks!

 

Best Regards,

Ben



#3 andysea

andysea

    Gemini

  • *****
  • topic starter
  • Posts: 3053
  • Joined: 03 Sep 2010
  • Loc: Seattle, WA

Posted 23 February 2018 - 11:52 AM

Great first light, Andy, and congratulations!

 

Could you please remind me what scope you are using with that camera?  Thanks!

 

Best Regards,

Ben

 

Thank you Ben.

I used the Vixen R200SS with the Vixen corrector PH. I'm waiting for some parts to arrive, in order to make a few improvements to the mirror cell. I think it's a good scope but it probably needs a more rigid tube.



#4 rockstarbill

rockstarbill

    Soyuz

  • *****
  • Posts: 3986
  • Joined: 16 Jul 2013
  • Loc: Snohomish, WA

Posted 23 February 2018 - 09:52 PM

Any tilt issues?

#5 andysea

andysea

    Gemini

  • *****
  • topic starter
  • Posts: 3053
  • Joined: 03 Sep 2010
  • Loc: Seattle, WA

Posted 23 February 2018 - 11:36 PM

Any tilt issues?

 

No I don't think it's tilt but I would have to test it with the Canon 6D. I think I see some difference in the star shape after a meridian flip. 
The mirror is held in place by three rubber clips along the front edge and there are also three set screws on the side that I think are used for centering it. 

There are actually six threaded holes in the mirror cell to hold the mirror along the edge. I have ordered six new set screws with a nylon tip, in order to distribute the pressure more evenly along the edge.

With respect to addressing the potential flex in the tube, I might have to order a carbon fiber tube from Germany. I haven't decide if that is really necessary tho.



#6 Peter in Reno

Peter in Reno

    Cosmos

  • *****
  • Posts: 9830
  • Joined: 15 Jul 2008
  • Loc: Reno, NV

Posted 23 February 2018 - 11:46 PM

What is the OTA tube made of? Aluminum? Steel? Fiberglass?

 

What is the back focus requirement for Vixen corrector PH?

 

Peter



#7 andysea

andysea

    Gemini

  • *****
  • topic starter
  • Posts: 3053
  • Joined: 03 Sep 2010
  • Loc: Seattle, WA

Posted 23 February 2018 - 11:49 PM

Peter the tube should be aluminum. The back focus for the corrector PH is 56.5mm.



#8 Peter in Reno

Peter in Reno

    Cosmos

  • *****
  • Posts: 9830
  • Joined: 15 Jul 2008
  • Loc: Reno, NV

Posted 24 February 2018 - 12:56 AM

Thanks Andy. That back focus is pretty tight for an imaging train containing filter wheel, OAG and camera.

 

I would start working on the mirror cell before upgrading the tube. Either way, so far your images have looked great. Your NGC 2903 looks much better than mine.

 

Peter



#9 andysea

andysea

    Gemini

  • *****
  • topic starter
  • Posts: 3053
  • Joined: 03 Sep 2010
  • Loc: Seattle, WA

Posted 24 February 2018 - 01:15 AM

The backfocus is fine. What I notice is that the stars, right after the meridian flip have a slightly different shape than before. That leads me to believe that there is something that is shifting or flexing.

#10 Kirek

Kirek

    Deerlick Astronomy Village

  • -----
  • Vendors
  • Posts: 7
  • Joined: 09 Sep 2011

Posted 25 February 2018 - 04:54 PM

Nice shot. What LRGB filters did you use? Looking at  this camera, and also  new larger filters. Don’t think my 1 1/4 filters will cut it :-) 



#11 andysea

andysea

    Gemini

  • *****
  • topic starter
  • Posts: 3053
  • Joined: 03 Sep 2010
  • Loc: Seattle, WA

Posted 25 February 2018 - 09:57 PM

I think that 1.25” should work. The sensor is pretty small. I used 31mm unmounted astrodon because I already had them.
  • AstroCatinfo likes this


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






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics