Celestron VARIABLE POLARIZING FILTER - 1.25”When you want to selectively reduce the brightness of celestial objects for a customized view, the Variable Polarizing Filter is the perfect choice. Unlike regular Moon Filters and Neutral Density Filters, the level of brightness can be reduced to just 1% or as much as 40%. To make the adjustment, simply rotate the filters lower ring and the image gets brighter or dimmer. This filter does not alter the color of the object youre observing, making it a