Northbound on my way to deliver meals-on-wheels at 11:30 a.m., I pulled up to a stop sign at an intersection, saw car in middle of road with 3 men in it, which had evidently come from the east, and one of them was leaning through driver's window aiming a white camera with a very long lens (about 1 to 1 1/2 feet long)at something. When I looked in that direction I at first thought it was an airplane he was filming, but as it tilted I saw it was a disk with a bubble on both the top and bottom some distance away, perhaps about 3 miles at about 20-30 degrees up from the horizon. To me, it seemed about the size of a twin-engine Cessna. I became a bit apprehensive when one of the men glared at me, so after about 5 seconds I pulled away from my stop sign and went on my way. I saw in my rear view mirror as I headed on north that the 3 men in the car had now turned south. I'm puzzled as to how these men knew about this object.