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Japanese 20 x 100 mm Binoculars

Details

The Japanese 20 x 100 mm model is a straight-through instrument that is fundamentally a scaled-up version of the 15x80. The objectives are air-spaced achromats and the prism system is a Porro II design. The eyepiece is an Erfle variation with a real field of 3 degrees and an apparent field of 60 degrees.