Astronomik H-alpha 6nm Clip-Filter EOS APS-C

Narrowband H-alpha emission-line filter

6nm FWHM bandpass

Transmission above

90% at 656nm

Canon EOS clip-in, covers APS-C sensors

Suppresses mercury and sodium lighting and skyglow

Parfocal with other Astronomik filters

Fits inside the camera body, retaining autofocus and metering

Planoptically polished glass