extension tubes question....
contacts report aperture (and other data!) information to the camera, but the actual stopping-down is carried out mechanically by the camera.
my tubes have the mechanical linkage to transfer the camera actions
https://pentaxphotogallery.com/artists/barrieforbes
https://www.flickr.com/photos/189482630@N03/
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256 posts
11 years
Newtownards,
NI.