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Author Topic: Conversion from Arc Lamps to Xenon Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 10-29-2000 11:53 AM                     Actually Steve that was the basis of my point throw only will matter in the transission of light when one reach's the extremes of the focal length scale Also 4" dia lens don't count since no one makes them now and the coatings on some of them are getting fairly brown Not to knock them though  |  IP: Logged Dave Bird Jedi Master Film Handler Posts: 777 From: Perth, Ontario, Canada Registered: Jun 2000 posted 10-29-2000 12:13 PM                        What diameters do they make now? For what purpose were the 4" lenses made?  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 10-29-2000 12:42 PM                     The 4" lens was designed to allow for the larger diameter to maintain a decent F stop number with the longer focal lengths In driveins in particular with real long throws lens of 7-8" fl were sometimes used The larger diametre allow better light transmision  |  IP: Logged Bill Enos Film God Posts: 2081 From: Richmond, Virginia, USA Registered: Apr 2000 posted 10-29-2000 11:27 PM                     Getting carbons is NO problem so far. We've been getting them from Marble for years. We compared theirs with Nationals using a meter and couldn't tell any difference. Their number is 800 759 5905.  |  IP: Logged John Walsh Film God Posts: 2490 From: Connecticut, USA, Earth, Milky Way Registered: Oct 1999 posted 10-30-2000 10:26 AM                     Personally, I didn't care for the Marble rods. While I didn't compare them according to light, (brightness and tempeture) I found they would break easier while both handling and running. I also liked the Nationals because you could join them together. IMOHO....  |  IP: Logged John Pytlak Film God Posts: 9987 From: Rochester, NY 14650-1922 Registered: Jan 2000 posted 10-31-2000 10:10 AM                        Brad has the excellent National Carbon Bulletins posted in the "Manuals" section. Lots of good information on the theory and practice of running carbon arcs. ------------------ John P. Pytlak, Senior Technical Specialist Worldwide Technical Services, Entertainment Imaging Eastman Kodak Company Research Labs, Building 69, Room 7419 Rochester, New York, 14650-1922 USA Tel: 716-477-5325 Fax: 716-722-7243 E-Mail: john.pytlak@kodak.com  |  IP: Logged

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