虹膜光圈

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1.	iris diaphragm 聚光器装有虹膜光圈 (iris diaphragm) 可用以调节进入镜系之光量。 4. 镜筒与套管 (Body tube) ：位於载物台之上，与镜臂 (arm… inner.tw100s.com\|Based on 15 pages

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AllAll,iris diaphragmiris diaphragm

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The light can be reduced by means of the iris diaphragm until the rulings stand out clearly against the background .