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Author Topic: Anamorphic Lenses ? Al Chaney Film Handler Posts: 33 From: Madison, AL Registered: Mar 2001 posted 03-22-2001 12:46 PM                     I anve recently acquired a Century C projector. My throw distance is 33ft in a screening room 20 X 40. Can some tell me what is the maximun widith I can get can and can I use my 16mm type "D" cinemascope Sankor lense on a 35mm projector? Thank Forum menbers Al Chaney Josh Jones Redhat Posts: 1207 From: Plano, TX Registered: Apr 2000 posted 03-22-2001 10:04 PM                        AFAIK, you picture width is a function of the prime lens, not the anamorphic. If you find out how tall the picture is in acadamy or 1.37:1, multiply that number times 2.37, and if your plate is cut properly, will give you your picture width. I could be wrong though. Anyone else? Josh John Pytlak Film God Posts: 9987 From: Rochester, NY 14650-1922 Registered: Jan 2000 posted 03-22-2001 10:16 PM                        Al: Check out the free Theatre Design Pro software available from Schneider Optics: http://www.schneideroptics.com/theatre/desprodn.html IscoOptic has a similar program called Cinema Lens Selector: http://www.iscooptic.de/english.html Not sure if a scope adapter designed for 16mm will adequately cover the full 35mm frame. ------------------ 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 Cell: 716-781-4036 Fax: 716-722-7243 E-Mail: john.pytlak@kodak.com Web site: http://www.kodak.com/go/motion Brett Rankin Film Handler Posts: 78 From: Sierra Madre, CA Registered: Jun 99 posted 03-23-2001 02:10 AM                     The 16-D probably won't be adequate unless your backup lens is of a very long focal length, like 5" (which, at 33 feet, will not produce a very big picture). You will get heavy vignetting in the corners, especially if you use such a large adapter that it acts as a barrel extender. Just find yourself a decent anamorphic lens designed for 35mm projection (older B&L's are cheap, and can be modified to focus down to 20 feet). The larger lens surface area will produce a sharper picture anyway. If you still want to use your 16-D, an adapter can be made out of various sizes of threaded PVC pipe to fit the different threading sizes on the two lenses. Brad Miller Administrator Posts: 17775 From: Plano, TX (36.2 miles NW of Rockwall) Registered: May 99 posted 03-23-2001 03:30 AM                     Go to the manuals download page here and download the Lens Calculator program. For quick and dirty calculations, it can't be beat. For more in depth calculations, go to www.schneideroptics.com and download their calculator. You will need "roughly" a 50mm prime lens for your anamorphic to get an "approximately" 12x28 foot image. (Must allow room for masking.) That will leave you needing "approximately" a 32mm lens for 1.85 flat. I wouldn't put any larger of a screen in that room, as you will be on the verge of having dark corners and focus issues. Forget trying to use that 16mm lens. Jeff Stricker Master Film Handler Posts: 481 From: Calumet, Mi USA Registered: Nov 1999 posted 03-23-2001 06:58 AM                     I have used a 16D mounted to a 3 1/2" prime lens without vignetting. The trick is to get it as close to the prime lens as possible. That's where I made some homebrew adapter parts! Of course, this is just fun home project

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