Sighting - Cigar shaped UFO with force field.

Has anyone else seen one anything like this?

This past summer, I was sitting on the front deck of our summer cottage over looking a calm lake;
the day was sunny and dry with only a few puffy clouds. I believe the sun was to my left and behind.

As I sat and talked with my family, I glanced up. From directly behind a cylindrical object passed overhead.
It was shiny, metallic silver, no evidence of wings or other protrusions, appeared to be roughly at least
the size of a 747 and was encapsulated in an opaque hourglass shaped field. The object was in full sight for almost a minute.
I sprinted inside for my camera, which was just 15 feet away, but had disappeared by the time I reached it.

Yes, i saw a similar craft twice. Just a few days ago. Read my 'Sightings in Sydney ' post. The craft I saw didn't seem to have a force-field though.