I have a Seneca #8 5x7 camera with a triple-convertible lens in an Autic shutter. The shutter appears to work well and has a hand-release or a bulb/air release connection. I have been looking around a bit for an air release bulb/tube but can't seem to find them anywhere. Does anyone know of a source I am missing? Thanks, Benno Jones See my homepage at http://www.bjonesphoto.com