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Author Topic: How to determine distance between lamp and gate? Gary Wachter Film Handler Posts: 21 From: Coppell, TX, USA Registered: Jul 2010 posted 03-29-2019 05:54 PM                     There have been plenty of discussions on aligning the optical axis, but little on the proper distance from the light source to the film. How would this be determined?  |  IP: Logged Matthew Ortado Film Handler Posts: 20 From: Halethorpe, MD, USA Registered: Jan 2010 posted 03-29-2019 07:56 PM                     Each lamphouse has a specific working distance. You would have to look at the manual, it is listed there.  |  IP: Logged Lindsay Morris Expert Film Handler Posts: 233 From: Darlington, WA, Australia Registered: Sep 2002 posted 03-30-2019 06:27 PM                     Each lamphouse having a specific working distance is tied in with the mirrors used in them. Most mirrors have a code on them something like 12 x 4 1/4 x 36 which is the mirror diam, the distance from the arc Pos tip to the mirror face and finally the working distance from the mirror face in the centre to the aperture and usually in inches. Have seen some in mm figures. If the mirror you have is a short working distance and your lamphouse is large/long you will probably not be able to focus the light source correctly. Any old mirror does not suit any lamphouse..select carefully.  |  IP: Logged

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