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2. Fully optical blue film coating, with strong permeability and high definition multi-layer FMC blue film coating, 1. Size: 180*60*140MM, Objective Lens Diameter: 35MM, Exit Pupil Diameter: 20MM, Field of View: 87M/1000M, 4. Sturdy and solid focus wheel, with non-slip vertical bar design. Effectively increase the friction with the focusing wheel, making focusing more convenient and practical. 3. Non-slip ring protection leather, high quality natural rubber protection skin for the environment, dte non-slip texture, comfortable grip, High transmission optical lens can improve light transmittance and reduce light reflection,