What is the purpose of the small brass "lever" on a Goerz Red Dot Artar (19")? Moving the lever reveals a slot in the lens housing. Is this slot for filters or some other application for using the lens as a process lens

-- Dave Willison (dwillisart@aol.com), February 11, 2001

Answers

It's for filters. James

-- lumberjack (james_mickelson@hotmail.com), February 11, 2001.

Or for Waterhouse stops that are like f/stops but are calibrated in a way that makes graphics exposure/magnification calculations possible. Process lenses don't generally need filters much indoors.

-- Rob Tucher (rtphotodoc@juno.com), February 12, 2001.