OPTOLONG 7nm NARROWBAND SHO FILTER SET QHY15 but it can also increase

but it can also increase tube turbulence due to unnecessary thermal output

This adapter is made anodized aluminium and adds an optical thickness of 5mm

the same thickness of the original focuser in order to allow you to reach focus with the telescope

2 x AR-Coating

OPTOLONG 7nm NARROWBAND SHO FILTER SET QHY15 but it can also increaseOptolong 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