OPTOLONG 7nm NARROWBAND SHO FILTER SET QHY15 2 x AR-Coating

2 x AR-Coating

These filters are sometimes Red or Yellow glass

5267 times the human eye

the CDK1000 sets a new standard in 1-meter class observatory telescopes

This configuration is designed to accommodate very heavy instruments

OPTOLONG 7nm NARROWBAND SHO FILTER SET QHY15 2 x AR-CoatingOptolong 7nm Narrowband filters boost 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 OIII and SII filter to compose a narrowband colour image. The 7nm band pass (6. 5nm for OIII & SII) is only 2% of the entire visible spectrum, increasing the signal to noise ratio and delivering high contrast images and extremely dark