does the following product exist?

Started Jun 1, 2013 | Discussions thread
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narddogg81
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does the following product exist?
Jun 1, 2013

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

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