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Upgrade your astronomical telescope with the D106 F600/F900 single diaphragm mirror lens, designed for superior clarity and improved imaging. Features a 106mm caliber and two focal lengths of 600mm and 900mm, making it versatile for various astronomical observations. The single-layer blue film coating improves light transmission and thus ensures brighter and clearer images of the body. Precision machined with a surface accuracy of 60/40 and a diameter tolerance of +0/-0.12 mm for optimal performance in science and education. Ideal for adult astronomy enthusiasts, educational institutions and scientific laboratories looking for optical accessories.