Todd-AO's Distortion Correcting Printing Process

Distortion Correcting Printing Process
By Grant Lobban
The process was originally designed to eliminate keystone distortion, distortion resulting from using a deeply curved screen, plus correcting the distortion arising from use of the extremely wide-angle lenses

The Ethel O’Brien Printer
By Walter P Siegmund
During our big move from Pomfret to Brooklyn many things were found which were long hidden and forgotten, including more old Todd-AO files and photos. You will may find the enclosed material of further interest in connection with the printing of the Todd-AO “Process”. These are descriptions and original calculations on various ideas about corrective printing the release prints.

Description of Todd-AO Mark III Printer Principle
By Dr. Walter P. Siegmund
The problem of obtaining any given overall frame keystone correction (K-correction) along with any given droop while at the same time matching the "intrinsic" printer keystone requires the control of several factors in the printing system. The focal length of the printer lens and the bridge angle determine the intrinsic keystone. The curvature of field of the printer lens and the bridge angle determine the droop.

"Oklahoma!" Printing Operation in the Todd-AO Mark III Printer
By Dr. Walter P. Siegmund
The American Optical Company has the responsibility of printing the release prints of the motion picture "Oklahoma!". In order that this printing may have the closest supervision, it is planned that, at least for the initial stages, this printing will be done in the Research Center in Southbridge.

Todd-AO's Mark III Distortion Correction Printer - A Galley
The Distortion Correcting Printing Process was initially meant to be an integrated part of the Todd-AO system. It was originally designed to eliminate three types of distortion, keystone distortion, distortion resulting from using a deeply- curved screen, plus correcting the distortion arising from use of the extremely wide-angle lenses, in both photography and projection.

TODD-AO PDF LIBRARY

• Preparation of Release Prints
• Additional Printing Ideas
• "Oklahoma!" Cue Sheet
• "Oklahoma!" Printing Operation

• American Optical Printing Lab
• Behaviour of the SSC printer
• CC Type Printer
• Geometry of first steps
• Definition of keystone formular
• Case for x1,7 magnification
• Calculations
• Rectification Printing

• Go to You are in the Show with Todd-AO

DISTORTION CORRECTING PRINTING PROCESS

• Go to Todd-AO's Distortion Correcting Printing Process