So you've got your first camera with interchangeable lens, and wondering which lens should I buy? Camera manufacture usually ship it's camera with a lens attached, standard kit lens. Usually, 18-55 mm (for APS-C), which equivalent to 24-72 mm (full frame). For starter this is a good lens, especially when it has feature such as image stabilization. But if you want more than that, first you need to know what type of lenses that suit for you.