NAKOH 60GT 0.65x REDUCER Stargate 5nm Highspeed F/2 filter is

5nm Highspeed F/2 filter is a precision-grade narrowband filter with a high transmission at the H-alpha line at 656

They are available in a huge range of sizes to fit telescopes from 80 to 180mm in diameter

2 on each side including one ED element per doublet Tripod thread

Phantom Coating Group

SKU TK-TKA19205

NAKOH 60GT 0.65x REDUCER Stargate 5nm Highspeed F/2 filter isThe NAKOH 0. 65x Flattener Reducer for the 60GT is a triplet corrector with a large 44mm image circle, compatible with full frame sensors. The 0. 65x reduction factor shortens the telescope's focal length to 234mm and focal ratio to f 3. 9, dramatically increasing the field of view while correcting off axis aberrations for imaging. The reducer has a backfocus requirement of 55mm, making it straightforward to connect common imaging trains. Both M48 x