Astromania 2" Variable Grey Polarizing Filter

Variable polarizing filters are made up of two high-grade glass individual filters. The variable darkening effect is produced by rotating the lower filter relative to the upper one. And it reduces glare without significantly altering the objects' colour for improved perception of detail and for better viewing comfort. This variable polarizing filter has a Aluminium material mount, which makes it difficult to be broken. It helps you to adjust the brightness effectively. The variable polarizing filter allows for selective adjustment of brightness, which is useful for terrestrial observation and objects of the Solar System. These filters have a very large range of effectiveness. Light transmission of polarizing filters is between 1% and 40%. Such adjustable control is highly desirable for lunar observing as the Moon's brightness varies with its phase and also with the aperture and magnification of the telescope you are using. It is also a must for viewing the Moon in daylight hours. Fit all 2" eyepieces with the standard filter thread.