Jump to content


Photo

SBIG ST-i Color vs Mono?

  • Please log in to reply
12 replies to this topic

#1 Learken

Learken

    Sputnik

  • -----
  • Posts: 38
  • Joined: 17 Mar 2005

Posted 30 January 2013 - 05:10 PM

Is there any significant difference between the SBIG ST-i color version vs mono version when used primarily for autoguiding? Does one work better than the other for autoguiding, or is there no real difference?

#2 Fogboundturtle

Fogboundturtle

    Viking 1

  • -----
  • Posts: 716
  • Joined: 20 May 2009
  • Loc: Burnaby, BC

Posted 30 January 2013 - 05:12 PM

I would believe the ST-i mono is more sensitive and would be easier overall to find a guiding star.

#3 Learken

Learken

    Sputnik

  • -----
  • Posts: 38
  • Joined: 17 Mar 2005

Posted 30 January 2013 - 05:36 PM

Thanks for your reply. Has that been your experience with mono guiders? I did notice on the forum that most people using the ST-i for guiding were using the mono version, that is what prompted my question.

I noticed one dealer was offering the color version for $100 off on thier web site.

#4 mmalik

mmalik

    Fly Me to the Moon

  • *****
  • Posts: 5355
  • Joined: 13 Jan 2012
  • Loc: USA

Posted 30 January 2013 - 06:19 PM

Just like any CCD, ST-i mono is more sensitive; for guiding mono is the way to go. Some discussion here.... Thx

Note: There is a guiding kit... as well.

#5 orion69

orion69

    Viking 1

  • -----
  • Posts: 994
  • Joined: 09 May 2010
  • Loc: Croatia

Posted 30 January 2013 - 06:54 PM

Go with mono, forget color...

#6 JoseBorrero

JoseBorrero

    Gemini

  • *****
  • Posts: 3144
  • Joined: 04 Sep 2009
  • Loc: Puerto Rico Island

Posted 30 January 2013 - 08:22 PM

color has a bayer matrix on top of the pixels, it said that this layer block essential light content.

#7 Learken

Learken

    Sputnik

  • -----
  • Posts: 38
  • Joined: 17 Mar 2005

Posted 30 January 2013 - 09:17 PM

Thanks all for the input, sounds like mono is the way to go.

#8 shams42

shams42

    Apollo

  • *****
  • Posts: 1108
  • Joined: 05 Jan 2009
  • Loc: Kingsport, TN

Posted 30 January 2013 - 10:31 PM

Additionally, I suspect that the Bayer matrix might play havoc with subpixel guiding algorithms. Mono all the way.

#9 microstar

microstar

    Apollo

  • -----
  • Posts: 1227
  • Joined: 05 Jan 2008
  • Loc: Canada

Posted 30 January 2013 - 11:52 PM

Additionally, I suspect that the Bayer matrix might play havoc with subpixel guiding algorithms. Mono all the way.


I suspect that as well. I always had drift problems when I was guiding with a DSI color that went away when I switched to a DSI mono.
...Keith

#10 DNTash

DNTash

    Viking 1

  • *****
  • Posts: 993
  • Joined: 01 Sep 2007
  • Loc: GMT+2

Posted 20 May 2013 - 08:04 AM

In my mind, this begs the question of the purpose of the ST-i color, and why SBIG would even offer it? Is it a decent color planet camera at least?

#11 Dan Crowson

Dan Crowson

    Viking 1

  • *****
  • Posts: 647
  • Joined: 08 Oct 2010
  • Loc: O'Fallon, MO

Posted 20 May 2013 - 09:13 AM

.. there's a reason why the color version is cheaper...

I think advertising these as planetary cameras is just marketing at best. You could probably buy a Canon DSLR and get better movie results for the same cost.

*I do love my ST-i mono for guiding. Moving to the ST-i and an OAG was one of the best decisions I made.

Dan

#12 Madratter

Madratter

    Fly Me to the Moon

  • *****
  • Posts: 6335
  • Joined: 14 Jan 2013

Posted 20 May 2013 - 09:35 AM

Well, as someone who has actually used both, I can say that:

1) The mono version is as expected somewhat more sensitive.
2) The color version is more than capable of guiding as well.

With my ST-i color, unbinned 4 second exposures, I get down to about magnitude 11 with a 50mm finder. Finding guide stars is not a problem.

Imaging M81 the other day, both M81 and M82 were easily visible in the ST-i color.

If you are going to strictly use it as a guide camera and you have the extra 100$, by all means buy the mono version.

But guiding with the color version has not been a problem for me.

#13 Madratter

Madratter

    Fly Me to the Moon

  • *****
  • Posts: 6335
  • Joined: 14 Jan 2013

Posted 20 May 2013 - 09:42 AM

Additionally, I suspect that the Bayer matrix might play havoc with subpixel guiding algorithms. Mono all the way.


In practice, this has not been the case for me. I am guiding with a Orion 50mm guider with helical focuser. I image with a Powerstar III c8 running at 1260mm.






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics