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Author Topic: Help needed: 2x and 1/2x Anamorphics Pete Lawrence Expert Film Handler Posts: 192 From: Middleburg, PA Registered: Aug 1999 posted 03-11-2002 09:25 PM                     I've been told that a normal 2x anamorphic adapter can be made to work as a 1/2x by simply reversing it. I've seen an example of an old B&L type 1 adapter, the BIG ones, mounted in reverse for drive-in use. When I try reversing my scope adapter I can't get it to focus. Throw is 23 feet and the screen is 10 feet wide for this test. The lenses I've been using are an ISCO Ultra MC 100mm prime and an ISCO Ultra Star HD 2x anamorphic attachment. This combination works great in the normal 2x mode. The reason for all this is I work with a non-profit group that runs a sci-fi convention here in NY. www.iconsf.org One of the studios has offered to let us run several 35mm prints at no charge. This years film budget is shot so I have to do this with equipment I already have at little or no cost. The auditorium we have access to has a screen 16 feet wide at a throw of 68 feet. Any help or suggestions would be appreciated.  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 03-11-2002 09:44 PM                     The Ultra-Star HD anamorphic (5-element) is not designed to work in reverse. Furthermore, there is no good way to couple the lens from the front. Also most reverse anamorphics are used on longer throws, hence the need for the reverse anamorphic. The reverse mode is never as good as the forward mode. The image on a reverse tends to geometrically out of whack. Steve ------------------ "Old projectionists never die, they just changeover!"  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 03-11-2002 10:19 PM                     If my memory is correct from the old kolmorgen stuff the focus scale is reversed  |  IP: Logged Steve Kraus Film God Posts: 4094 From: Chicago, IL, USA Registered: May 2000 posted 03-12-2002 05:39 PM                    Can you reverse a Panatar?  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 03-12-2002 06:38 PM                     Well you can reverse the space shuttle too but it'll crash! Why on earth would anyone want to reverse a Panatar??? In using the long throw Isco reverse anamorphs I did notice a lot better definition than if a 2x were used. There was some distortion but it was not too bad. Mark @ GTS  |  IP: Logged

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