Can Sigma 150 to 600mm lens be used for wedding photography?

No. You can’t use a 150-600 mm lens of any brand in the wedding as this telephoto lens is suitable for wildlife photography or sports photography. You won’t get that much space in wedding venues where you can use it as it’s focal length starts from 150 mm and goes up to 600 mm. So it’s strictly no for Sigma 150-600 mm lens for wedding photography.