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Learken
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Reged: 03/17/05

SBIG ST-i Color vs Mono? new
      #5652793 - 01/30/13 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?

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Fogboundturtle
professor emeritus


Reged: 05/20/09

Loc: Burnaby, BC
Re: SBIG ST-i Color vs Mono? new [Re: Learken]
      #5652795 - 01/30/13 05:12 PM

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

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Learken
member


Reged: 03/17/05

Re: SBIG ST-i Color vs Mono? new [Re: Fogboundturtle]
      #5652840 - 01/30/13 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.


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mmalik
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Reged: 01/13/12

Loc: USA
Re: SBIG ST-i Color vs Mono? new [Re: Learken]
      #5652937 - 01/30/13 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.


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orion69
scholastic sledgehammer


Reged: 05/09/10

Loc: Croatia
Re: SBIG ST-i Color vs Mono? new [Re: mmalik]
      #5653013 - 01/30/13 06:54 PM

Go with mono, forget color...

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JoseBorrero
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Reged: 09/04/09

Loc: Puerto Rico Island
Re: SBIG ST-i Color vs Mono? new [Re: orion69]
      #5653144 - 01/30/13 08:22 PM

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

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Learken
member


Reged: 03/17/05

Re: SBIG ST-i Color vs Mono? [Re: JoseBorrero]
      #5653227 - 01/30/13 09:17 PM

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

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shams42
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Reged: 01/05/09

Loc: Kingsport, TN
Re: SBIG ST-i Color vs Mono? new [Re: Learken]
      #5653347 - 01/30/13 10:31 PM

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

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microstar
Pooh-Bah


Reged: 01/05/08

Loc: Canada
Re: SBIG ST-i Color vs Mono? new [Re: shams42]
      #5653443 - 01/30/13 11:52 PM

Quote:

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


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DNTash
scholastic sledgehammer
*****

Reged: 09/02/07

Loc: Germany
Re: SBIG ST-i Color vs Mono? new [Re: microstar]
      #5873270 - 05/20/13 09:04 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?

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Dan Crowson
professor emeritus
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Reged: 10/08/10

Loc: O'Fallon, MO
Re: SBIG ST-i Color vs Mono? new [Re: DNTash]
      #5873385 - 05/20/13 10:13 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


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Madratter
Post Laureate


Reged: 01/14/13

Re: SBIG ST-i Color vs Mono? new [Re: Dan Crowson]
      #5873433 - 05/20/13 10:35 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.

Edited by Madratter (05/20/13 10:36 AM)


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Madratter
Post Laureate


Reged: 01/14/13

Re: SBIG ST-i Color vs Mono? new [Re: shams42]
      #5873449 - 05/20/13 10:42 AM

Quote:

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.


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