• All of the NextGEN series reducers accept the standard 48 mm filter thread commonly referred to as 2-inch filter size. The filters from Optec are of the highest photographic quality and available with many varied transmission characteristics to enhance contrast, reduce background illumination, or block certain wavelengths.
Since the Optec filters have threads on only one side, they can not be stacked. #8 pale yellow filter does a better job of blocking violet and UV light at the expense of some blue. It is recommended for monochromatic use when the most energy flux is to be passed.