Antlia ALP-T 5nm H-alpha/OIII Dual-Band Filter - 2" Mounted

Antlia ALP-T Dual Band is a premium Dual narrowband nebula filter (2" mounted). Passbands: H-alpha 656.3 nm (5 nm) / OIII 500.7 nm (5 nm).

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.