IDAS GNB Galaxy & Nebula Booster Filter - 1.25" Mounted (M28.6)

IDAS GNB Galaxy & Nebula Booster Narrowband Imaging Filter 1.25" Mounted (M28.6) is a budget-friendly multi-band nebula filter (1.25").

Best for emission nebulae with one-shot color cameras, especially from light-polluted skies.

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.