Optolong SHO 3nm Filter Set - 2" Mounted

Optolong SHO 3nm (3 Filter Set) - 2" Mounted is a midrange narrowband filter (2").

Best for isolating emission lines with a mono camera and filter wheel.

Choose filter size around the sensor diagonal, telescope speed, and filter-wheel or drawer geometry. Flats are still required; a filter can improve contrast, but it will not rescue tilt, bad focus, or poor calibration.