82 degree Field - Wide FOV for high and low magnifications. * Retractible eyecups - Ultra-low profile for eyeglass wearers * Parfocal eyepiece - Little or no focusing is needed when changing from low to high power. * Threaded barrels - Accept 1-1/4" Celestron thread-in filters. * Polished and hard anodized aluminum barrel - Scratch resistant and high end appearance.