ANTLIA ENERGY REJECTION FILTER 130mm Leonardo These Bessel-UBVRI filters are still

These Bessel-UBVRI filters are still standard today and are also the most widely used in amateur circles such as the AAVSO

WO-M-GS61-RD (Red)

Ships in watertight pelican style equipment case for dust & humidity-free storage

25x glasspath corrector and the 2"/T-2 Nosepiece

ANTLIA ENERGY REJECTION FILTER 130mm Leonardo These Bessel-UBVRI filters are stillThe Antlia 130mm Energy Rejection Filter is a multi coated dualband filter designed to reject the majority of light at both ends of the spectrum, with two narrow transmission windows of only 25nm half bandwidth around the H alpha and Calcium K & H lines. This enables safe usage of H alpha and Calcium solar filters with telescopes by preventing as much extra energy as possible from entering the telescope. The 130mm ERF is suitable for use on telescopes