Filter for sky glow

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river
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Filter for sky glow

Post by river »

Hi all,

I am using a LPR filter, it improve contrast for some objects but cant bring out many dimmer objects. Do you think I should get OIII and/or H-alpha filter :?: Assumed using >=5" scope.

Do people stack up filters together? eg. One LPR + one colour :?: thanks
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weixing
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Favourite scope: Vixen R200SS & Celestron 6" F5 Achro Refractor
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Post by weixing »

Hi,
am using a LPR filter, it improve contrast for some objects but cant bring out many dimmer objects. Do you think I should get OIII and/or H-alpha filter Assumed using >=5" scope.
Other Filters will only work on nebula... it won't work on galaxy & star clusters. Get a UHC filter should be good enough.
Do people stack up filters together? eg. One LPR + one colour thanks
Colour filter is only use for planetary observation, so I don't think anyone will use it with LPR filter.

Have a nice day.
Yang Weixing
:mrgreen: "The universe is composed mainly of hydrogen and ignorance." :mrgreen:
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Airconvent
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Re: Filter for sky glow

Post by Airconvent »

river wrote:Hi all,

I am using a LPR filter, it improve contrast for some objects but cant bring out many dimmer objects. Do you think I should get OIII and/or H-alpha filter :?: Assumed using >=5" scope.

Do people stack up filters together? eg. One LPR + one colour :?: thanks
welcome to singastro!

LPR is used to reduce the streetlight glow, i.e. it is designed to block off that portion of visible light that is characteristic of sodium lamps like street lights. as it blocks part of the visible spectrum, naturally objects will be dimmer but it can darken the background in light polluted areas, hence improving contrast.

OIII and other narrow band filters are designed to allow ONLY spectrum that is emittted by emission nebulae to pass through, so naturally, they block out most light except that from the nebula. this makes the nebula stand out.
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kingkong
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Post by kingkong »

good references for DSO filters:

Useful Filters for Viewing Deep-Sky Objects
http://www.cloudynights.com/item.php?item_id=63

Filter Performance Comparisons for Some Common Nebulae
http://www.cloudynights.com/item.php?item_id=387
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river
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Post by river »

Thanks for all your advice, it helps to clear some doubt :)

Also find this useful: Observing the Planets with Color Filters
http://www.lpl.arizona.edu/~rhill/alpo/ ... LTERS1.HTM
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