Product series:
The photography of galactic nebulae with extremely fast optics can only really be effective with the f/2 Highspeed filter.
The full width at half maximum of this filter is optimised for fast apertures of f/1.8 to f/3.5, where despite the high line broadening at this aperture ratio, a high contrast is still possible.
The filters are also ideal for Celestron RASA Astrographs.

Baader
Filters H-alpha CMOS f/2 Highspeed 1.25"
$ 155.00
ready for shipping in 1-2
weeks

Baader
Filters OIII CMOS f/2 Highspeed 1.25"
$ 154.00
ready for shipping in 1-2
weeks

Baader
Filters f/2 Highspeed SII CMOS 1.25"
$ 153.00
ready for shipping in 1-2
weeks