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Oxygen and Sulphur vs RGB


libraryman

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Hi all, i'm considering buying the Astrodon Oxygen and sulphur filters to match my 5nm Ha filter, i currently  have RGB filters in my filter wheel, what are the real benefits of the Oxygen etc over RGB when used with Ha?

i know of course that it opens up the Hubble palette but beyond that are there any other reasons to go with the NB Oxygen etc over the RGB?

Ray 

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Yes, the Astrodons are narrow pass filters so will aid in the reduction of light pollution in your images. They are very different in the wavelengths they capture from broadabnd RGB and limited to emmision nebula only, Oxygen and Sulphur can be very dim and defuse in signal so be prepaired for long exposures (others can be quite bright planetary nebula for example).

Some nebula contain no signal at all from one or either of them so you will need to pick your targets. A different ball game to RGB entirely.

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If you want to try just one, go for the OIII filter because there is much more signal in many objects using this filter than with SII. OIII is right on the cusp between 'green' and 'blue' so it can be used for both a 'green' channel and a 'blue' channel in conjunction with the Ha channel (mapped to red) to produce a bi-colour image rich in detail.

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Hi all, i'm considering buying the Astrodon Oxygen and sulphur filters to match my 5nm Ha filter, i currently  have RGB filters in my filter wheel, what are the real benefits of the Oxygen etc over RGB when used with Ha?

i know of course that it opens up the Hubble palette but beyond that are there any other reasons to go with the NB Oxygen etc over the RGB?

Ray 

lets hope you have the opportunity for imaging with very long subs in particular with Oiii, in most cases 1200s to 1800s is normal even with fast systems.

A.G

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Yes, if you're going for just one then get an Oxygen (OIII) filter. Don't thinkyou just need to stick to the standard look just because you don't have the full set, you can still get some creative and interesting colour paletts out of just 2 filters.

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