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TOPIC: What Lens To Use?

What Lens To Use? 16 Aug 2001 08:15 #21017

I was currently looking over some literature, and noticed that CINEX has 2.35 aspect lenses. I know that scope is usually the 2.39:1 aspect ratio, so which one do you use?

Andy
Since 1987
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Re: What Lens To Use? 16 Aug 2001 10:00 #21018

  • John Pytlak
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Standard SMPTE 195 specifies the current 35mm projection formats. The current "scope" format has an image area of 0.825 x 0.690 inches (20.96 x 17.53 mm), and uses a 2X anamorphic lens to produce a 2.39:1 aspect ratio on the screen. The older standard of 0.838 x 0.700 inches (21.29 x 17.78 mm) also had an aspect ratio of 2.39:1. Prior to that, the image area was 0.839 x 0.715 inches, which is where the 2.35:1 figure comes from.

Current anamorphic pictures all use a 2X squeeze factor for the lens. The focal length of the prime lens and the throw determine the image size.

Schneider Optics has "Theatre Design Pro" software to calculate the effect of various lens and theatre design parameters:
http://www.schneideroptics.com/theatre/theatre.htm

I researched the history of the "scope" image area, which is available at Marty Hart's American Widescreen Museum:
http://www.widescreenmuseum.com/widescreen/apertures.htm



John P. Pytlak, Senior Technical Specialist
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John P. Pytlak, Senior Technical Specialist
Customer Technical Services
Entertainment Imaging
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Eastman Kodak Company
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Re: What Lens To Use? 16 Aug 2001 10:09 #21019

Thanx, Mr. Pytlak!

Andy
Since 1987
The administrator has disabled public write access.
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