The eyelets in a fence are much larger than your average camera lens. If you can go right up to the fence, the problem is solved.<p>Reflections from glass are minimized by also sticking the camera lens right up to the glass, and providing some shading around it. A simple lens skirt could be developed for this purpose (if such a thing doesn't exist already).<p>Possible design: cone-shaped coil spring encased in opaque cloth, with rubber o-ring gaskets fitted on both ends. One gasket (narrow end) goes on the camera/phone around the lens, the flared end gasket goes onto the glass.