High grade Schott optical glass is vat dyed for even color coating; then anti reflection coated for maximum light throughput; each filter has a metal filter cell and is threaded for use with 1.25 inch telescope eyepieces and filter threaded accessories
Handy color planetary telescope eyepiece filters help enhance your view of the planets and Moon; unveiling specific features and enabling you to discern more detail
The filter mount is precision manufactured from metal and is extremely thin to minimise shadowing and diffraction; the threads on both sides of the filter make it also possible to combine different filters
Seamless Magnification Control: A simple twist of the zoom housing adjusts focal length from 7mm to 21mm; Ideal for planetary clusters, lunar details, and deep-sky nebulae observation
Extended Eye Relief for Eyeglass Users: 16 to 33 mm adjustable eye relief accommodates eyeglass wearers with zero vignetting; Foldable soft-rubber eyecup ensures comfortable viewing at all focal lengths