Hi all, I was thinking of trying my older uncoated 300mm 6.8 Goerz Dagor as a convertable lens by removing the front cell. Does anyone know what the f stops will be with the front lens removed? Or the focal length? Has anyone tried this? What is the quality of the Dagor with the front removed? Is the coverage the same? I cant try this out till my new camera comes in as I dont have the bellows draw. Thanks for your input!