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In general, it is called a 'lensbomg' macro lens. It means a macro lens that is assembled from a dismantled lens. The preferred lens choices are prosumer lenses, handycam lenses, or video shooting lenses. The lens is only taken as the main lens (the frontmost lens group or called the objective lens). The way we select it is by peeking directly at the lens with our eyes to determine which one suits what we want. Our eyes or a cellphone camera, through the objective lens, will get a closer focus distance, get sufficient magnification.... this is basically like a magnifying glass for reading.... only we are looking for good quality