does the following product exist?
Does anyone make a scope of some kind for the sole purpose of framing a shot/determining composition at various focal lengths without using the camera and lens? Something that you could keep out around your neck at all times? I know there are some card based solutions where you hold out cards with a cutout in front of you at various distances to simulate different focal length framing, but that seems cumbersome. Google search did not come up with anything. Thanks in advance