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Author Message   Msiegel Tinkerer Username: Msiegel Post Number: 306 Registered: 03-2008 Rating: N/A Votes: 0 Posted on Friday, September 28, 2012 - 10:57 am:    I found something on the Ilford version here: http://www.photomemorabilia.co.uk/Ilford/Sportsman_Auto_and_ARF.html Quote from that site: The user operates the camera by selecting a shutter speed on the lens barrel and then turns the aperture ring until a red needle coincides with the (selenium cell driven) white needle in the cut out on the (LHS) camera top plate or in the rectangular green field visible in the top of the viewfinder. End quote. Usually the red triangle (needle) has just an mechanic link to the aperture while the white needle moves depending on selected shutter speed and light. This system is basically found in various versions even in SLR cameras (Canon e.g. comes to my mind) So in short: If the needles coincide the correct f-stop/shutter speed combination is selected. Hope this helps.