Brilliant finder TLR, c1947.   72mm f/8 front elemment focusing lens (not coupled to the finder of course.)  Any shutter speed you want as long as it's I (instant) or B.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/13100797@N07">E Magnuson</a>
CC BY 2.0
<p><a rel="nofollow" class="external text" href="https://www.flickr.com/photos/maderik/4188221959/">Kodak Duaflex IV</a>
</p>
<ul><li>Uploaded by <a href="//commons.wikimedia.org/wiki/User:Tm" title="User:Tm">tm</a></li></ul>