Star Colour Sub Length?

[PhotoGav]

Hello wise imagers, I seek your help...

I am working on an image of NGC7000 using an ED80 & 383 chip in Ha & OIII and would like to add some RGB data. What sub length and bin would be advisable? I have plenty of Ha & OIII Subs of 1200s at 1x1. I'm thinking of doing the RGB subs for 600s at 2x2 and 5 of each. Will that give good star colour? Or should I go for shorter subs?

I hope you can offer me some pointers.

Thank you.

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[RikM]

Personally I would go shorter and bin 1x1. You don't need masses of integration time just for star colour.

[PhotoGav]

Thanks Rik. Something like 300s?

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[swag72]

Do a quick test image Gav. I'd start off with 100s and then move upwards until you reach a point where the stars are not saturated and you are capturing as much data as possible as well. It's a bit of a balancing act.

[PhotoGav]

Thank you Sara, that sounds like a good plan.

As for star saturation, I guess I just don't want them to be pure white in the mono image...?

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[swag72]

Check the ADU of the stars. You'll saturate the bigger ones in the middle fully, but you don't want them all at max ADU.

That's how I do it anyway!

[PhotoGav]

Perfect, thank you.

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[ollypenrice]

Yes, shorter is better for star colour. Do you have a plan for how to apply it? I haven't done much of this since I only use NB to enhance LRGB.

Olly

[PhotoGav]

Good question Olly...

My first dabblings with the mono CCD are becoming quite a meander through all the possibilities. My intention was to make an LRGB image enhanced with NB. However, it is turning into an Ha/OIII bi-colour, with RGB star colour... My plan is to add the RGB star image as a layer with blend mode 'colour'. We'll see what actually happens when I start processing in earnest!

I would love to hear how you go about your enhanced LRGB images... It's probably more than a reply on SGL though. If I had some money left I would be sending you an email regarding availability at Les Granges!

No doubt many more questions to follow......