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Kroncke光学系统基本组 (115V/60 Hz)
Kroncke光学系统基本组 (230V/60 Hz)
Convex Lens K, f = 500 mm
Concave Lens K, f = -100 mm
Optical Rider K
Convex Lens K, f = 50 mm
Concave Lens K, f = -500 mm
Convex Lens K, f = 150 mm
Convex Lens K, f = 100 mm