Lenses that are 180mm are telephoto macro. Most companies make macro lenses in this range. This length is a good trade-off between cost and working distance. Lenses that are 90, 100, and 105mm are normal macro lenses. Short working distances also make illumination difficult because light is often blocked by the lens itself. This distance between the end of the lens and the subject is the working distance. They’re fine for static objects like postage stamps but aren’t very good for animate macro subjects, particularly skittish insects, since the lens has to be extremely close to the subject. Lenses that are 50mm are short macro lenses. There are three basic focal lengths for macro lenses on a full-frame camera:50mm, 100mm, and 180mm. The only thing to note is that these lenses are very sharp and can sometimes reveal too much detail of a person’s face, exposing certain flaws we’d rather have blurred out. They often make excellent portrait-length lenses. Most of the macro lenses can also be used as regular lenses. A ring flash, which is simply a flash unit with curved tubes that fits around the end of the lens barrel, is perfect for many types of close-up illumination. Macro lenses often have to be positioned extremely close to their tiny subjects, which makes lighting very difficult.
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