Quad band filter??????

[Merlin66]

https://optcorp.com/products/opt-triad-ultra-quad-band-narrowband-filter

Is this what you were waiting for????

[that_guy]

$1000 usd... Nope!

[traveller]

Actually it’s not a bad price for an all in one filter, esp at that bandpass.

[Ukastronomer]

https://optcorp.com/products/radian-triad-tri-band-narrowband-filter