..the Agfa Isolette series are about as rigid and well-aligned as it gets for a folder, and the lens is good too. As others have mentioned the bellows is generally the worst aspect of the camera. Whatever, careful and disciplined use is essential if you are to avoid blank frames or oof images. This is due to the camera's 'blocking' mechanism and non-coupled rf. You really cannot 'rush' one of these cameras - when you press the shutter button you've got to commit. Backing off is not allowed or the 'block' will be activated. The technique is to 'push and hold down'.