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Author Topic: Simplex E7 question Pete Lawrence Expert Film Handler Posts: 192 From: Middleburg, PA Registered: Aug 1999 posted 03-03-2000 08:27 PM                     I have a question about ancient history someone here may be able to answer. The Simplex E7 manual (available on this site)shows two shutters, one between the lamp and the film as usual and a second mounted out in front of the lens. Both rotate in the same direction on opposite ends of the same shaft. Any E7's I've seen in the past (including the ones I have) had the front shutter assembly removed. The only hint it was ever there is the extra long shaft sticking out the front. What was Simplex trying to do with this configuration? Here's my guess as to what they intended, let's see anyone has a better answer. The two shutters, in effect, work the same as two counter-rotating shutters next to each other or a barrel shutter. Fewer degrees of rotation are required to blank the light and as a result longer light-on time. Something important back when drive-ins needed to squeeze all the light they could out of their arc lamps. Anyone got a better idea? Thanks, Pete  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 03-03-2000 08:48 PM                     You are basically correct they had to be removed to accomodate most cinemascope adapters Because the second shutter is in front of the lens it does the same effect as counter rotating shutters in the brenkert and century because the light beam has been inverted It is also usuable in a narrow range of focal length of lens as the angular cutoff vs RPM is dependent on the angle of the cone of light  |  IP: Logged Robert Throop Master Film Handler Posts: 412 From: Vernon, NY USA Registered: Jun 99 posted 03-05-2000 11:23 AM                     Brenkert did the same thing with their BX62 which was a BX60 with front and rear shutters. ------------------  |  IP: Logged

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