This Explore Scientific 1.25" Variable Polarizing Filter allows continuous adjustment of image brightness, which is very helpful for strong contrast differences in various observation objects. It is especially suited to lunar and planetary observation, but also useful for solar viewing to prevent blooming. A suitable protection filter is required for solar observation.

When using a Herschel wedge with large lens openings, the variable polarization filter can reduce the brightness of observed objects to a comfortable level. The wide control range of 40 to 1% light transmission and the neutral gray filter effect create a pleasant and unadulterated image. Operation is very simple. By turning the two halves of the housing, the desired strength of the filter effect is set. The inside/outside threads allow the simultaneous use of other color filters.