In history, Canon has been launched 200 mm f/2.0 lens. Telephoto lens has an aperture of big guns has a selling price of nearly 130 million, and weigh up to 2.5 Kg more. Therefore, to achieve the big guns opened up to f/1.0, ancient lens 200 mm f/1.0 Germanium Thermal Lens brands Rank-Taylor has more weight 18 Kg
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