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Old 04-09-2013, 08:52 PM
White Rabbit's Avatar
White Rabbit
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Location: Sydney
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Would someone mind having a look at these RGB subs for me.

Hi guys.

This is a two part question.
1.I'm having a hell of a time with my blue subs. I refocus after every filter change but still get bloated stars. Is this normal?

2. How do I select an appropriate length of RGB subs when I'm using an Ha filter for the lum?

This is a rar file (18MB) with 4 subs Ha and RGB only the RGB is binned at 2x2. The RGB fits are all roughly the same FWHM of 2.55 and are all the same exposure duration. As you can see the big stars in the field are quote bloated.

The filters are Astronomik RGB type 2, camera was an SBIG STF 8300m.

Thanks in advance for any advice you can give.


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Old 06-09-2013, 01:09 AM
Joshua Bunn's Avatar
Joshua Bunn (Joshua)
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Join Date: Oct 2011
Location: Albany, Western Australia
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mmm, dont know. Except the obvious which is pretty much the whole star is saturated. what do shorter exposures look like.

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