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Astrophotography and Sketching >> DSLR & Digital Camera Astro Imaging & Processing

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Jerry Lodriguss
Vendor


Reged: 07/19/08

Loc: Voorhees, NJ
M103 and Clusters in Cassiopeia new
      #5625741 - 01/16/13 08:07 AM Attachment (45 downloads)

Cassiopeia is rich in open clusters, such as this interesting area around M103.

http://www.astropix.com/HTML/SHOW_DIG/M103.HTM

Click on the link to see a larger version with more information.

This image was shot with a 70mm ED doublet refractor at 420mm of focal length at f/6 with a 1x field flattener.

2 x 300 seconds, 4 x 450 seconds, 3 x 600 seconds exposures at ISO 400 were shot unfiltered (70 minutes total exposure) with a modified Canon T2i (550D) and stacked.


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srosenfraz
Post Laureate
*****

Reged: 03/06/11

Loc: United States
Re: M103 and Clusters in Cassiopeia [Re: Jerry Lodriguss]
      #5626135 - 01/16/13 12:48 PM

Spectacular grouping of clusters, Jerry. As always, love the star colors!

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Jerry Lodriguss
Vendor


Reged: 07/19/08

Loc: Voorhees, NJ
Re: M103 and Clusters in Cassiopeia new [Re: srosenfraz]
      #5627368 - 01/17/13 02:39 AM

Hi Scott,

Thank you!

Jerry


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bouffetout
scholastic sledgehammer


Reged: 11/21/12

Loc: Canada
Re: M103 and Clusters in Cassiopeia new [Re: Jerry Lodriguss]
      #5634658 - 01/21/13 10:30 AM

Makes me dream of skys without clouds ! Awesome picture Jerry !

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fco_star
Pooh-Bah
*****

Reged: 12/13/10

Loc: Texas, Midland
Re: M103 and Clusters in Cassiopeia new [Re: bouffetout]
      #5634726 - 01/21/13 11:06 AM

Jerry, beautiful picture as always.

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Jerry Lodriguss
Vendor


Reged: 07/19/08

Loc: Voorhees, NJ
Re: M103 and Clusters in Cassiopeia new [Re: fco_star]
      #5635884 - 01/21/13 10:49 PM

Thanks!

Jerry


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piaras
professor emeritus


Reged: 01/26/09

Loc: Niagara Region
Re: M103 and Clusters in Cassiopeia new [Re: Jerry Lodriguss]
      #5635918 - 01/21/13 11:10 PM

Very nice. I wish I could get the star colors better on mine. How are you preventing the stars from being saturated to white in the stack? I have yet to figure that out.
Pierre


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Jerry Lodriguss
Vendor


Reged: 07/19/08

Loc: Voorhees, NJ
Re: M103 and Clusters in Cassiopeia new [Re: piaras]
      #5635938 - 01/21/13 11:17 PM

Hi Pierre,

Thank you.

When you shoot, don't overexpose the stars, and use a relatively low ISO for star clusters.

When you stack, use average as the combine method.

When you process, pay attention to the white point, don't clip it.

Jerry


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Toxic Coolaid
professor emeritus


Reged: 10/01/11

Loc: NorthEast Tennessee
Re: M103 and Clusters in Cassiopeia new [Re: Jerry Lodriguss]
      #5635997 - 01/21/13 11:49 PM

You always have new and wonderful targets. Do you always use Average combine or only for star clusters. I never have understood if there is a best set of settings to always use, or if they need to vary per project.

Mo


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Jerry Lodriguss
Vendor


Reged: 07/19/08

Loc: Voorhees, NJ
Re: M103 and Clusters in Cassiopeia new [Re: Toxic Coolaid]
      #5636029 - 01/22/13 12:29 AM

Hi Mo,

Thank you.

I always use min-max average combine in Images Plus, for almost everything.

Once is a while I might use a sigma median combine if I need to get rid of a satellite trail if I don't want to throw an exposure out and have lots of subs.

Jerry


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