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珠宝用放大镜是一种最常用的宝石检测工具,具有结构简单,操作方便,便于携带的优点。由于珠宝检测的特殊要求,这类放大镜的制作也比较严格,其光学质量,不应低于低档照像机镜头。因此,在购买的时候,应注意以下几个方面: 1.放大镜的通光口径,以18毫米左右为宜。 2.通过镜头观察一平面,中心与边缘应同样清晰;观察一直线时,边缘与中心应同样粗细。 3.通过镜头观察一白底黑字时,黑字笔划的边缘不能出现黄色或蓝色的晕带。
Jewelry with a magnifying glass is one of the most commonly used gem detection tools, with the advantages of simple structure, easy operation, easy to carry. Due to the special requirements of jewelry testing, such magnifying glass production is also more stringent, its optical quality, should not be lower than the low-end camera lens. Therefore, when buying, should pay attention to the following aspects: 1. Loupe through the caliber to about 18 mm is appropriate. 2. Through a lens to observe a plane, the center and the edge should be equally clear; observe a straight line, the edge and the center should be the same thickness. 3. Observe a black and white through the lens, the black strokes can not appear on the edge of the yellow or blue halo zone.