I have been thinking of upgrading my NB filters. Baader have introduced their range of Ultra Narrowband filters. Link to the Ha one is here
https://www.baader-planetarium.com/e...nm-filter.html
Ha has 3.5nm bandwidth, while the OIII and SII are 4.5nm.
Just seeing if anyone has any experience with these, any thoughts?
Also I have been told that narrow Ha filters miss out on a nearby emission line, have not been able to find info on that online. Would anyone know if that would be the case with these?
Cheers
Malcolm