I was looking at property in the Valsequillo Reservior near the city of Puebla, Mexico. I was taking photographs of the view, looking across a small bay.Later that day, I reviewed my photos and noticed something in one shot that was not there when I took the photo. The object appears to be moving quickly from the right to the left. It is about 150 feet above the ground, based on the height of the trees. It appears to be metallic and disc shaped. Using a home below as a point of reference, it appears to be 15-20 feet in diameter. A close up reveals an interesting anomoly below the object, which appears to be a "wake" or distortion.