All Metal premium quality
1st position - UHC NEBULA filter UHC (Ultra High Contrast) filters block a large fraction of light pollution, and bring out the details of planetary nebulae and most of emission nebular under a dark sky.
2nd position - #11 Planetary filter.Helps to bring out dark surface detail on Jupiter and Saturn, darkens the maria on Mars, and improves visual detail when viewing Neptune and Uranus.
3rd position - Clear to use any other filter you like or compare your observations
M28.5X0.6 standard filter interface
Filed under: Eyepieces & Accessories