I recently bought a Brand View #17 camera, It came with a Betax No4 shutter and a Aetna Actinar 180mm f4.5 Lens. It came with a few other lenses as well but the only one that fits is the Aetna. However the camera will not focus to infinity. I get the feeling that the problem might be that the Aetna lens wasn't meant to be mounted on the Betax shutter. However I don't know enough about nay of this to be shure. Does anyone have any information that might be useful. Like can the Aetna be mounted on the Betax No4? Or what shutter would I need to mount the Aetna on or what lens can I mount on the Betax No4?