Report of Commission I, Optical and Modulation Transfer Working Group 
Clarice L. Norton, Chairman 
Gerald C. Brock and Dr Roy Welch 
Abstract 
The Optical and Modulation Transfer Functions Working Group has 
been concerned with updating Section 6 of "Procedures for Calibrating 
Photogrammetric Cameras and Related Optical Tests." As presently 
proposed, it is expanded to include guidelines for MTF analysis 
techniques of camera systems. The revision is printed in full. 
The status of OTF/MIF standards in various nations is reviewed 
and there is a report of current testing results performed by the 
SIRA group on a photogrammetric wide field lens which shows good 
correlation among laboratories. 
The application of MTF technique in the analysis of aerial and 
space photography has proved a reliable evaluation of the quality 
of operational systems when control targets are lacking. The results 
are reported. 
A study by the U. S. Air Force shows the reliability and feasi- 
bility of employing edge gradient techniques in control of performance 
of aerial photographic systems. 
This working group report also contains a short summary of current 
papers and meetings on the subject of image quality using OTF and 
MIF evaluation techniques and makes recommendations for further study.