ZWO 7nm Narrowband Filter Set - 2" Mounted

ZWO 7nm Narrowband 2-inch Filter Set is a midrange SHO narrowband filter set (2"). Passbands: H-alpha 656.3 nm (7 nm) / OIII 500.7 nm (7 nm) / SII 672 nm (7 nm).

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.