The Explore Scientific FirstLight 102mm Doublet Refractor Telescope is a versatile optical tube designed for astronomers who demand precision and clarity. With a 102mm aperture and a 1000mm focal length (f/9.8), this refractor delivers crisp, high-contrast views of planets, deep-sky objects, and lunar details. Fully multi-coated lenses ensure optimal light transmission, while the 2.5" hexagonal focuser provides smooth, accurate focusing—perfect for both visual observation and astrophotography. The included 25mm Plössl eyepiece, red dot viewfinder, and smartphone adapter make setup and imaging easy, and the 2" 90° diagonal enhances comfort during extended viewing sessions.