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Author Topic: Spider and the Fly  (Read 1771 times)

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Offline branchman

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Spider and the Fly
« on: 16:06:09, 23 March, 2013 »
Hi,
Took this last month and it seems to be a bit of a mess to me.
Seen other examples which show more resemblance to the name.
This is made up of 9 x 7 mins Ha at F3.8 12 " Orion AG.
Any thoughts help etc would be appreciated.
Image attached L & C worked.
Should I post the combined image as a Jpeg or is this OK?
Chris
AG 12 inch, PMX, SBIG STXL 6303E, MaximDL, The Sky, PS6

Offline chris.bailey

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Re: Spider and the Fly
« Reply #1 on: 16:38:36, 23 March, 2013 »
Chris

Much of this object is quite faint so 9x7 is probably not really enough data even at f3.8. In stretching it you have clipped off the white point (a risk in using the levels slider in photoshop) so big areas are clipped to white. Stars seem very square, was this binned 2x2?

Chris
LX200|ZS70|FSQ85|FLT110|Altair DF250RC|EQ6 Pro(Rowan Belt Mod)|ParamountMX
ATIK383L+/EFW2/OAG|Lodestar|Baader 36mm LRGBHaSIIOIII
Starlight Express SXVRH16/ONAG/FW|Lodestar X2|Baader 2" Filters
Starlight Express SXVRH814/ONAG/FW|LodestarX2|Baader 2" Filters
Lunt LS60PTBF1200|DMK41|Quark Chromo
Samyang 135mm f1.8

Offline roundycat

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Re: Spider and the Fly
« Reply #2 on: 16:40:58, 23 March, 2013 »
can't say that I have seen this one before or heard of it, does it have an NGC number?

The image is overstretched and the background has been left much too light. Typically 35% instead of about 10-12%. It's generally not possible to redeem the stretch in a jpeg, I have darkened it but the stars are still blown.

What is L&C worked?

Dennis

Offline branchman

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Re: Spider and the Fly
« Reply #3 on: 16:54:08, 23 March, 2013 »
Chris & Dennis,
Thanks for the quick feedback. NGC 1931 (Spider) IC 417 (Fly).
Binning 1x1 and have had guiding issues but think this is not the case here.
Levels & Curves (L & C) Dennis.
Will go back and look at the amount of and use of levels to get that white point back. Using laptop screen and think I do not get a proper feel for the image. Need a new monitor!
Chris
AG 12 inch, PMX, SBIG STXL 6303E, MaximDL, The Sky, PS6

Offline chris.bailey

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Re: Spider and the Fly
« Reply #4 on: 16:55:18, 23 March, 2013 »
Dennis

NGC 1931 (fly) and IC 417(Spider) in Auriga. The spider is quite a lot bigger again. They have been on my list for a while now but the weather has not been kind and its rapidly getting too low to do it justice :-(

Chris
LX200|ZS70|FSQ85|FLT110|Altair DF250RC|EQ6 Pro(Rowan Belt Mod)|ParamountMX
ATIK383L+/EFW2/OAG|Lodestar|Baader 36mm LRGBHaSIIOIII
Starlight Express SXVRH16/ONAG/FW|Lodestar X2|Baader 2" Filters
Starlight Express SXVRH814/ONAG/FW|LodestarX2|Baader 2" Filters
Lunt LS60PTBF1200|DMK41|Quark Chromo
Samyang 135mm f1.8

Offline roundycat

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Re: Spider and the Fly
« Reply #5 on: 21:29:37, 23 March, 2013 »
Chris, this might help http://www.dens-astropics.org.uk/page%2014.htm

Be very careful stretching with Levels, it is akin to doing the job with a blindfold on. Use mid point only and not more than 1.5-2. After three or four iterations of Levels (depending on the gamma value chosen) use only Curves and target the nebulous bits carefully. At least this way you can see what is happening to the data.

Dennis

Offline branchman

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Re: Spider and the Fly
« Reply #6 on: 17:11:55, 24 March, 2013 »
Dennis,
Thanks for the link and advice. Now been able to have a better look as last view was via IPhone. Your site has plenty of information and will print off some of the tips.

Chris,
just knew I would get them the wrong way round!!

Cloud and now snow!! Will it ever get better?
Thanks both again,
Chris
AG 12 inch, PMX, SBIG STXL 6303E, MaximDL, The Sky, PS6

 

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