Has anyone here had the good fortune to examine a Robin Hills cloud camera as manufactured in the 1920s by R&J Beck Ltd. London? Has anyone examined a negative exposed with one of these cameras? I realize that a 8mm fisheye lens on a 35mm camera will give a 180 degree circular image. Supposedly, the Hill Cloud Camera had a f8 lens with a focal length of 25mm and a Circle of Definition of 2.5 inches. If one wanted to make a "Cloud camera" today in a larger format than 35mm. Is there a lens that is available today that will provide horizon to horizon coverage of 180 degrees and that will give a circle of definition of 2.5 inches or larger? With thanks, Sam H.