Optolong SHO 3nm Filter Set - 36mm Unmounted

Optolong SHO 3nm (3 Filter Set) - 36mm Unmounted is a midrange narrowband filter (36mm).

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.