Jump to content


Can I use Narrowband Filters with my 127 Frac?


Recommended Posts

Would I get any benefit from using narrowband filters for imaging with my 127mm refractor?

I have read that OIII filters are only for 'bigger scopes'.

My interest is DSO's (especially nebula!).

I am thinking of buying a QHY8L at a later date - should I go for 2" filters (if I can use narrowband with scope).

Many thanks in advance for any advice :)

Link to comment
Share on other sites

Depends which ones you use. Some narrowbands are narrower than others, eg: the Baader O-III which I found, in my opinion, needed 8" plus of aperture to get satisfying images. I used to use ( and enjoy) an Orion Ultrablock with my 4" refractor and now I have an Astronomik O-III which works well with the same scope - the Astronomik allows a little more light through than the Baader does so is nicer to use with smaller apertures.

Link to comment
Share on other sites


I was looking at the sets as sold by FLO....

Now wondering if using a 0.5 reducer would affect the use of filters :)

Thanks John, I will take a look at the Astronomik filters, if you are using one of their O-III's ok, then they should work equally well for me.

Edited by Interested
Link to comment
Share on other sites

Thanks Olly,

I know you have owned the same scope as me so probably have a good idea of what filters I could/couldn't use.

If you can use a O-III on a 70mm then I might just go for one of the filter sets sold by FLO, but.......1.25" or 2"?

If (thinking aloud here) I buy a QHY8L then probably the 2" will be more useful?

Link to comment
Share on other sites

I use a Baader O111 right down to 70mm in the Pronto. It helps things like the Veil and Rosette to pop out. No problems that I can see.


Like so many bits of astro equipment, the final choice depends on personal preferences :)

I like to see some background stars when viewing DSO's and the Baader O-III just dims out too many for my taste when the aperture drops below 8".

If I can get away with it, I tend to prefer unfiltered views on the whole which might explain my preference for more moderate filters, when I do need to use them.

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Recently Browsing   0 members

    No registered users viewing this page.

  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.