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300sec or 600s?

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#1 Calzunen

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Posted 16 October 2021 - 06:43 PM

I'm planning on shooting sh2 129, and the OIII data is very faint. Is it better to go for longer subs or can I stick with the standard 300s?

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#2 imtl

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Posted 16 October 2021 - 06:46 PM

There is no standard 300s. It depends on the speed of your optics, your camera specs and your LP/dark sky situation.

#3 kathyastro

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Posted 16 October 2021 - 07:38 PM

If you need the longer subs and your guiding and light pollution situation can handle them, go for it.  My standard for Oiii subs is 900s.


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#4 ChrisWhite

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Posted 16 October 2021 - 09:27 PM

Mine is 1200s.

But a better approach, that applies to all cameras and scope combinations is to expose as long as you can without clipping too many stars.
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#5 Calzunen

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Posted 17 October 2021 - 02:54 AM

Mine is 1200s.

But a better approach, that applies to all cameras and scope combinations is to expose as long as you can without clipping too many stars.

With narrowband I always clip my stars... I have skywatcher 150pds (f5)...

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#6 ChrisWhite

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Posted 17 October 2021 - 06:35 AM

With narrowband I always clip my stars... I have skywatcher 150pds (f5)...

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You will always clip stars with any filter. The balance is to not clip "too many." People really over think this concept. It doesn't need to be complicated... its not.
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#7 SapperUp

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Posted 17 October 2021 - 12:27 PM

Mine is 1200s.

But a better approach, that applies to all cameras and scope combinations is to expose as long as you can without clipping too many stars.


I wonder, could you maybe take two sets of exposures? One with clipped stars but pulling more detail from nebulae, and a short, maybe 30-60s subs to get nice star colour? Then you can just combine them. I've never done it and wouldn't know how but just a thought.

#8 ChrisWhite

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Posted 17 October 2021 - 12:59 PM

I wonder, could you maybe take two sets of exposures? One with clipped stars but pulling more detail from nebulae, and a short, maybe 30-60s subs to get nice star colour? Then you can just combine them. I've never done it and wouldn't know how but just a thought.


You can, but with these ultra low noise cmos cameras that most people are using nowadays you can achieve both in one exposure. Details and star color. You can capture extremely faint details with relatively short exposures.


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