Celestron Moon Filter and Philips Guide to The Night SkyCelestron's Moon Filter is an economical eyepiece filter for reducing the brightness of the moon and improving contrast, so greater detail can be observed on the lunar surface. The clear aperture is 21mm and the transmission is about 18%. Screws on to the filter thread of any Celestron, or other manufacturer's 1.25 inch eyepiece.The Philips Gude to the Night Sky takes the reader on a guided tour of the stars and constellations seen from the northern hemisphere, using easily recognizable key star groups to 'jump' from one area of the sky to the next. All stars shown on the maps can be seen with the naked eye.
Back to top