An accessory for a mobile computing device having a camera with a field of view (FOV), includes: an adapter including: an inner wall having a first opening; a retention mechanism configured to releasably retain the mobile computing device against the inner wall with the camera positioned over the first opening; an outer wall joined to the inner wall by a set of side walls, the outer wall having a second opening with a second perimeter larger than a first perimeter of the first opening; a set of channel walls extending between the first perimeter of the first opening and the second perimeter of the second opening, the set of channel walls defining an open channel permitting the camera FOV to traverse the adapter substantially unobstructed; and a handle mount disposed on the outer wall.