Dark Clear Skies 2″ UHC Filter ST4 Port with the IP67 waterproof and

with the IP67 waterproof and dustproof function

Main feature:

Bahtinov mask and charging cable included

contrast-rich view with a generous field of view

It has a reduction factor of 0

Dark Clear Skies 2″ UHC Filter ST4 Port with the IP67 waterproof andThe Dark Clear Skies 2 UHC (Ultra High Contrast) Filter is designed to enhance the visibility of emission nebulae by selectively transmitting key nebular wavelengths while suppressing background skyglow and common sources of light pollution. Purpose & Use UHC filters are widely used in astronomy to improve contrast between emission nebulae and the surrounding sky. By reducing unwanted wavelengths from artificial lighting and natural skyglow, this