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Author Topic: Best RGB exposure for Star Colour  (Read 223 times)

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Offline midnight_lightning

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Best RGB exposure for Star Colour
« on: 15:48:51, 07 January, 2018 »
Hi,

I took a NB of IC410 last week with 20min exposure and whilst the nebula is great the star colours are all burned out to white.

Thought I would go out tonight and reshoot with RGB just to capture the stars so I can layer them on my NB photo.

I don't know what exposure to use, I'm guessing 5 mins but would be grateful for views?

Thanks

Jon
HEQ5 Pro (Belt Mod), Sky Watcher Esprit Pro 80/400, SX Mini Filter Wheel with OAG - Lodestar X2, SX814, Software - SGPro, PHD2, Stellarium (Scope), EQMOD, DSS, Star Tools.

Offline chris.bailey

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Re: Best RGB exposure for Star Colour
« Reply #1 on: 16:12:14, 07 January, 2018 »
Mid

When you say the star colours are "all" burned out to white what do you mean? Are the cores all at 65,535? Pretty unusual for that to be the case with NB filters.

With NB remember that you do not really have RGB, its more RRB so star colours won't look right. If you want to layer on RGB stars for a more natural colour be aware this is not that easy to do as the size of the stars will vary considerably from their NB counterparts.

Chris
LX200|ZS70|FSQ85|FLT110|Altair DF250RC|EQ6 Pro(Rowan Belt Mod)|ParamountMX
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Starlight Express SXVRH16/ONAG/FW|Lodestar X2|Baader 2" Filters
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Offline midnight_lightning

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Re: Best RGB exposure for Star Colour
« Reply #2 on: 16:50:49, 07 January, 2018 »
Hi Chris,

It's the image below, I'm not sure how to measure the saturation but its just typical NB stars with very little colour.
I thought this would look much better if I could reshoot the area in RGB, use a star mask to remove the stars and them layer them back on.

I had wondered whether star size might be different but for some reason thought the RGB stars might be bigger and more bloated - perhaps not?

I'm probably not going to get out tonight now but would be interested to know whether it's worth trying?

EDIT Just thinking about it perhaps just masking the stars in the existing image and pushing saturation might make a difference?

Jon
HEQ5 Pro (Belt Mod), Sky Watcher Esprit Pro 80/400, SX Mini Filter Wheel with OAG - Lodestar X2, SX814, Software - SGPro, PHD2, Stellarium (Scope), EQMOD, DSS, Star Tools.

Offline chris.bailey

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Re: Best RGB exposure for Star Colour
« Reply #3 on: 17:02:21, 07 January, 2018 »
Yep plenty of colour in them there stars...might not be the right colour but there is colour  :thumbup:
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 midnight_lightning

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Re: Best RGB exposure for Star Colour
« Reply #4 on: 17:12:00, 07 January, 2018 »
:) thanks Chris, I'll see what I can tease out.
HEQ5 Pro (Belt Mod), Sky Watcher Esprit Pro 80/400, SX Mini Filter Wheel with OAG - Lodestar X2, SX814, Software - SGPro, PHD2, Stellarium (Scope), EQMOD, DSS, Star Tools.

 

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