illumination form:big spot,small spot,red free,central net,slit,half spot
diopter compensation :0 ±1 ±2 ±3 ± 4 ±5 ±6 ±8 ±10 ±15 ±20 (D)
illumnation bulb:2.5V/0.35A
power supply:1.5V×2"AA"type
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