The UHC filter can reduce the negative impact of artificial lights and airglow when shooting deep sky objects. Just install the filter on the filter adapter, then attract the adapter to the camera's glass.

Attention: To install the UHC/ND filters on DWARF II, you need to use DWARFLAB's magnetic filter adapter. When shooting the sun, you need to install two ND filters for the two cameras in DWARF II, or it may damage the sensor of DWARF II.