A telephoto prime lens provides fantastic image high quality at lengthy focal lengths resulting from a large maximum aperture and magnification on the subject, and can be handheld in lowlight conditions. When comparing a telephoto prime to a normaltotelephoto zoom, though zoom lenses cover wide ranges, they ordinarily have a smaller maximum aperture around the lengthy finish. Remember that on a crop sensor, the helpful focal length of a telephoto prime is multiplied by 1.five.