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

Single, Double and Triple Stacked disks in Ha 10/17/2020

  • Please log in to reply
12 replies to this topic

#1 hopskipson

hopskipson

    Mercury-Atlas

  • *****
  • topic starter
  • Posts: 2,748
  • Joined: 24 Jun 2010
  • Loc: Queens, New Yawk, Light pollution Headquarters!

Posted 18 October 2020 - 11:51 AM

I had a lot of time to experiment collecting data in different wavelengths and stacking configurations.  Here are 3 disks, excuse the orientation.  I had to really push the gain to around 260 to fill the histogram. Unfortunately, it made processing the triple-stacked image difficult to process. I also noticed a more pronounced grid pattern on the 178 chip.  I'm guessing the more narrowband wavelength will produce this artifact.  The single-stacked version had problems with even illumination no matter what I did.  I tried a flat and that didn't work very well so all are without  a flat frame calibration.

 

Equipment used: Lunt 60 mm pressure tuned and 2 Coronado 90mm DS etalons.

 

Single

Sun_130049_179_lapl6_ap2708ImPPGps.jpg

 

Double

Sun_133143_284_lapl6_ap2737ImPPGps.jpg

 

 

 

 


  • Bagwell likes this

#2 hopskipson

hopskipson

    Mercury-Atlas

  • *****
  • topic starter
  • Posts: 2,748
  • Joined: 24 Jun 2010
  • Loc: Queens, New Yawk, Light pollution Headquarters!

Posted 18 October 2020 - 11:52 AM

Triple

Sun_134728_157_lapl6_ap2720ImPPGps.jpg


  • BinoGuy and Bagwell like this

#3 starzonesteve

starzonesteve

    Viking 1

  • *****
  • Posts: 702
  • Joined: 17 May 2014
  • Loc: Central Alabama

Posted 18 October 2020 - 12:08 PM

Thanks much for the comparison images. It is really impressive to see how much additional differentiation in sun surface activity there is to be seen as you go from single stack to triple stack!

 

I often use your guys’ images to decide whether or not to pull out my Lunt 100mm double stack on a particular day. That triple stack image makes me want to take a peek!


  • hopskipson likes this

#4 dhkaiser

dhkaiser

    Viking 1

  • -----
  • Posts: 766
  • Joined: 23 Dec 2019

Posted 18 October 2020 - 12:18 PM

Actually I think the DS is best, and am surprised you had trouble getting on band in single.


  • hopskipson and gustavo_sanchez like this

#5 hopskipson

hopskipson

    Mercury-Atlas

  • *****
  • topic starter
  • Posts: 2,748
  • Joined: 24 Jun 2010
  • Loc: Queens, New Yawk, Light pollution Headquarters!

Posted 18 October 2020 - 12:49 PM

Actually I think the DS is best, and am surprised you had trouble getting on band in single.

I agree the DS looks most appealing but I find the triple to be very interesting showing lots of different features.  This was just an experiment and I have to get better tuning to optimize this system.  I have lots of other images to follow.

 

I think the SS image suffers more from uneven illumination more than not being on band.  I still have to work on my technique.



#6 rigel123

rigel123

    Hubble

  • *****
  • Posts: 18,155
  • Joined: 29 Jun 2009
  • Loc: SW Ohio

Posted 18 October 2020 - 01:46 PM

Interesting James, I agree the DS looks best.
  • hopskipson likes this

#7 PhotonJohn

PhotonJohn

    Surveyor 1

  • -----
  • Posts: 1,683
  • Joined: 11 Dec 2007
  • Loc: Viera Florida

Posted 18 October 2020 - 02:35 PM

DS is best James.
  • hopskipson likes this

#8 bigdob24

bigdob24

    Surveyor 1

  • *****
  • Posts: 1,523
  • Joined: 19 Apr 2008
  • Loc: Central Illinois

Posted 18 October 2020 - 03:04 PM

I’m glad the DS looks great now I don’t have to order another front mounted filterwink.gif


  • rigel123 and hopskipson like this

#9 hopskipson

hopskipson

    Mercury-Atlas

  • *****
  • topic starter
  • Posts: 2,748
  • Joined: 24 Jun 2010
  • Loc: Queens, New Yawk, Light pollution Headquarters!

Posted 18 October 2020 - 06:00 PM

A close-up of AR2776 in triple-stack mode.  I used an ASI290 MM and I can see some kind of grid pattern.

 

Sun_135525_231_lapl6_ap1065ImPPGps.jpg



#10 hopskipson

hopskipson

    Mercury-Atlas

  • *****
  • topic starter
  • Posts: 2,748
  • Joined: 24 Jun 2010
  • Loc: Queens, New Yawk, Light pollution Headquarters!

Posted 18 October 2020 - 07:50 PM

One last triple-stacked

 

Sun_140018_378_lapl6_ap1628ImPPGps.jpg



#11 sunnyday

sunnyday

    Voyager 1

  • *****
  • Posts: 11,094
  • Joined: 23 Sep 2019
  • Loc: the Canadian nebula .

Posted 18 October 2020 - 07:58 PM

I like the difference between each stack.
I must be the only one but I find the triple stack has more to show me. thanks.



#12 starzonesteve

starzonesteve

    Viking 1

  • *****
  • Posts: 702
  • Joined: 17 May 2014
  • Loc: Central Alabama

Posted 18 October 2020 - 10:51 PM

I am with you sunnyday. Although the DS pic is more aesthetically pleasing, I like the surface differentiation that the triple stack provides. 



#13 peterm

peterm

    Explorer 1

  • -----
  • Posts: 61
  • Joined: 31 Mar 2007
  • Loc: Gold Coast, Queensland, Australia

Posted 18 October 2020 - 11:38 PM

Thanks for showing the difference in stacking! I'm hoping to try the double stack tomorrow weather permitting. Your double stack is the pick for me.




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