Abstract: An adapter device for easily and effectively mounting an optical device to a mobile device. The adapter device includes a housing body, a magnetic attachment mechanism, and a lens-attachment mechanism. The lens-attachment mechanism includes an annular body to receive the optical device. The magnetic attachment mechanism includes a metallic plate and at least one magnet. The metallic plate is attached to the mobile device and the magnet is mounted within the housing body. The metallic plate is positioned adjacent to a front panel of the housing body in order to attach the mobile device to the housing body. The lens-attachment mechanism being mounted to the housing body with the annular body is positioned adjacent to a rear panel of the housing body. The annular body receives and holds the optical device in order to optically couple the mobile device and the optical device.