From no more then 3 feet away. I used the Rokinon 14mm lens on a full frame camera while standing about 3 steps down the access stepladder. I held the camera over my head against the glass hoping it would be wide enough to get the whole lens. It covered the lens plus some. This was one of the better ones even with a crucial mistake being made.
This lighthouse is still in use but showing it's age. It could really use a paint job on the inside. Hope that's not lead paint.