A 50mm macro lens can double as a "normal" lens on a full frame camera. Macro lenses can, of course, be used for non-macro work, and again the focal length may be a consideration. However longer focal lengths mean larger, heavier and more expensive lenses. It can also make working with live subjects (e.g. A larger working distance may mean that it's easier to get light onto the subject (since the camera is less in the way). From the macro point of view, increasing focal length means increasing working distance. Each has it's advantages and disadvantages. Macro lenses typically come in 3 focal lengths, "normal" - 50mm, 90 or 100mm and telephoto - something like 180mm. So for a full frame camera that means you can fill the frame with an object as small as 4.8mm x 7.2mm (3mm x 4.5mm for an APS-C camera).
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