Optolong SHO 3nm Filter Set combines H-alpha, SII and OIII filters, each with a 3 nm passband.

Key features

• Three separate 3 nm filters

• For monochrome narrowband imaging

• 2″ mounted or 36 mm unmounted

Choose your size

Select the mounted diameter or unmounted format required by your filter wheel or holder. Check clearance and sensor coverage before ordering.