OIII

[algol]

so has any of you guys or gals had experience with an OIII filter?

i've heard good things about them as i have about the skyglow filters. my area suffers from a bit of skyglow, and most galaxy's are almost unobservable. so i was wondering what your opinions on these two filters are.

scope details in sig.

[Andrew*]

Almost certainly an OIII won't do you any favours on galaxies.

However, they certainly do a good job on targets emitting OIII like planetary nebulae, and thus are not general purpose but rather specialised.

I had an excellent view of m42 with an OIII. This website gives you a great idea of what targets particular filters work best on. The UHC is shown to be the best all-round filter.

For galaxies, consider a CLS or LPR filter. CLSs are proven to do an excellent job of cutting light pollution.

HTH

Andrew

[scotastro]

Algol

Be aware that the OIII and UHC filters work by only letting specific narrow parts of the visible light through - so with a 130mm scope so much light can be blocked that the object you want to see is not better and sometime looks worse.

Try getting a s/h light pollution filter to try first before spending a lot on a OIII (or UHC) filter.

Scotastro

[GazOC]

Andrew, I've been looking for that link on and off for the last few months.. Thanks!!! :hello1:

[Andrew*]

It's a good one, eh?

Andrew

[GazOC]

Very good, the best I've found. I posted here a couple of times but lost it and couldn't find it by forum search. "Filters" turns up too many results!!

[Andrew*]

I know! Can't remember how I found it now... :scratch:

[GazOC]

Looks like searching SGL for "RayCash" was the way to go!