Common narrowband imaging filters

[Granada]

What are some of the more common narrowband imaging filters that you'd recommend for purchasing (e.g. Ha/Sii/Oiii)? I haven't got any at the moment so I'd like to start off by purchasing ones that will see frequent use for DSOs.

[Atmos]

You've picked the most common three on the market. The only other one that you're likely to come across without going custom is the NII filter. A 5nm Ha filter contains the NII emission so you need both to be 3nm to isolate them from each other.

You can get filters like a Hb but they're usually not "narrowband" as such as they have a fairly wide emission and include OIII.

[seriousfun]

I'd defiantly go Ha first then Oiii the Sii.

You will get a lot of use out of Ha by adding to galaxies and nebula. For galaxies it brings out the lovely red knots in the arms and for nebula it gives a fantastic luminance layer.

[srmnm]

UVIR filter can help with getting good luminance layer for use in combination with the common narrowband filters mentioned, when you merge channels.
I use HA,OIII,SII & UVIR.