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by MatthiasH in cultural-heritage-history
Magnification: 6x Aperture (objective diameter): 30 mm Field of view: 8.5° Exit pupil diameter: 5 mm Visible field of view (eyepiece FOV): 50° The closest focusing distance: 3.2 m Width: 16.8 cm Height: 11.6 cm Weight: 595 g Production date: 1939