Magnifying glass, an optical instrument creating a magnified visual image of an object, plays a fairly important role in kinds of researches and people’s daily lives. However, few know how to purchase a high quality magnifying glass. Here are several points as follows.
Firstly, magnifying glasses of high quality are often made from optical glasses or upscale resin pellets with high transparency and low dispersion. Such magnifying glasses create clearer and brighter images with small color differences. Secondly, the mirror surface of a high quality magnifying glass is aspheric. In this way, the imaging within sight is ensured to be of fine definition and low distortion. For the high expense of lens grinding, inferior magnifying glasses are spherical, which get low definition on the brink. Thirdly, a superior magnifying glass should be covered with a film of reflection reducing coating on the lens, so as to on one hand protect magnifying glass from scratches, and on the other hand increase imaging definition. Usually, magnifying glasses with films are of 10% elevated transparencies. Fourthly, judge a magnifying glass by its frame. For durability, excellent frames are usually made from metal frames with certain thickness or plastic frames of high tenacity. Last but not the least, high quality magnifying glasses are marked with explicit names and addresses of manufacturers and detailed brand information, while inferior ones just simply mark the producing places.
In conclusion, points on how to buy a high quality magnifying glass are briefly illustrated above, which are hoped to be useful for you when you are in want of a magnifying glass.
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