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M103 and Clusters in Cassiopeia

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#1 Jerry Lodriguss

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Posted 16 January 2013 - 08:07 AM

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

http://www.astropix....OW_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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#2 srosenfraz

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Posted 16 January 2013 - 12:48 PM

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

#3 Jerry Lodriguss

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Posted 17 January 2013 - 02:39 AM

Hi Scott,

Thank you!

Jerry

#4 bouffetout

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Posted 21 January 2013 - 10:30 AM

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

#5 fco_star

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Posted 21 January 2013 - 11:06 AM

Jerry, beautiful picture as always.

#6 Jerry Lodriguss

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Posted 21 January 2013 - 10:49 PM

Thanks!

Jerry

#7 piaras

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Posted 21 January 2013 - 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

#8 Jerry Lodriguss

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Posted 21 January 2013 - 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

#9 Toxic Coolaid

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Posted 21 January 2013 - 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

#10 Jerry Lodriguss

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Posted 22 January 2013 - 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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