[Ian Robinson]

Originally Posted by Tandum

So your confused too

Optcorp have pages of them to choose from -> http://www.optcorp.com/ProductList.a...9-327-1157-861

3nm filters for US$1055

I suppose so , not tried imaging in Halpha (yet) , might now I have a nice digital SLR , but the narrow band notch halpha filter will have wait a while I think.

I can think of a lot of things I would rather spend several hundred or a housand or so dollar on before that,.