Boy! I saw one of these today. Glad I didn't have to lug that thing around to get my job done as a sports photographer! I wonder how many were made? The one I saw today had a 28" f5 Zeiss Jena Triplet. They must have pushed the film quite a bit to get action shots in Yankee Stadium, where the owner of the camera says that this one was used. The handle on the side is a sort of speed shift, to get the focus right for each of the bases where the action might be happening at any given moment. Here are a couple in action.