I will swear by these three mid-price lenses as starter lenses for fashion photography.50mm 1.4 (full length fashion/set location)85mm 1.4 (mid length fashion/studio)100mm 2.8 (Beauty/jewelry/fashion)The reason for avoiding zoom lenses when possible is because prime lenses have less glass for a sharper image. You will have faster aperture for a more shallow depth of field. You may not have the flexibility of the zoom ranges but then again that’s what feet are for. I would rather have to move closer or back up from my subjects a bit than to sacrifice sharpness and clarity.An great mid-price lens for Runway fashion photography is the Canon 24-105mm L Series. It has decent zoom with fast focus since during runway shows you don’t have the freedom to move around as much.This photo was taken with a Canon EF 24-105mm f/4L IS the the Mercedes Benz Fashion Week Swim show of Minimale Animale

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Source: What lens is the best for fashion photography? – Quora