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60mm Double Separation Multi-layer Lens Designed for DIY Astronomical Telescopes Refractors. Versatile focal lengths available (300, 360, 400, 500, 600, 700, 800, 900mm) to meet different astronomical observation needs. It has a green film coating on all sides for better light transmission and a better image (1/4-1/8). Precision engineering with diameter tolerance of +0/-0.12mm and focal length tolerance of ±0.1% for optimal performance. Includes two sets of double separation lenses for refraction, perfect for both telescope lenses and star seekers.