OPTOLONG SII 6.5nm NARROWBAND FILTER Size:2" 25" and 2" filters

25" and 2" filters

Integrated 25mm blocking filter

2 standard on each side

the Veloce now uses an innovative Nano Coating® which has an amazing resistance to dust and moisture and a better transmission over a wider wavelength bandwidth range

To optimize the power absorption

OPTOLONG SII 6.5nm NARROWBAND FILTER Size:2" 25" and 2" filtersThe Optolong SII 6. 5nm narrowband filter boosts the contrast of emission nebulae and supernova remnants for professional results, even under a bright sky affected by light pollution. This filter is used in combination with the H Alpha and SII filter to combine a narrowband colour image. The 6. 5nm band pass is only 2% of the entire visible spectrum, increasing the signal to noise ratio and delivering high contrast images and extremely dark