Sky Mentor ND4 Neutral Density Filter - 25% Transmission - 1.25" AC Adapter 57 arc seconds Light Gathering

57 arc seconds Light Gathering Power (Compared to human eye) 843x Secondary Mirror Obstruction 2

Perfect for Astro & Terrestrial Photography

Slew speeds are infinitely variable through the movement of the joystick

Celestron AstroMaster 90AZ Telescope - 90mm Refractor w/AltAzimuth Mount Specifications

Sky Mentor ND4 Neutral Density Filter - 25% Transmission - 1.25" AC Adapter 57 arc seconds Light GatheringSky Mentor ND4 1. 25" Neutral Density Filter This Neutral Density (ND) filter is suitable for 1. 25" eyepieces & other 1. 25" barreled accessories. Neutral Density filters are preferred as a moon filter due to their neutral color, the ND4 filter can reduce the overall brightness of the moon's surface by 75% (transmission is 25%) so you can see more details and surface features of moon with your telescope, even during its fuller phases. We also offer