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2.3 The above Section 6 substitution with any modifications agreed 
on by Commission I members, shall be submitted as a resolution 
at the 1976 Congress. 
3. THE OTF/MTF WORKING GROUP 
3.1 Working Members: Clarice L. Norton, Chairman of the Working 
Group has been ably supported by Gerald C. Brock and Dr Roy Welch, 
both long recognized for their contributions to the study and use 
of MTFs, 
Clarice Norton worked for several decades in industry at Fairchild 
Camera where she was involved in determining the photographic per- 
formance quality of aerial lenses and cameras, becoming interested 
in MTF testing when it was first investigated for the Air Force 
(Brock, Itek). Now working at the Maintenance Director's Camera 
Calibration Facility at Hill Air Force Base in Utah, she is becoming 
increasingly involved with image quality controls, standards, and 
techniques, particularly as chairman of an Air Force committee 
which is developing regulations and updating technical orders to 
provide image quality control of aerial and space photographic 
systems. 
Gerald C. Brock, now at W. Vinten Ltd, Suffolk, Great Britain 
is continuing the research work on MTFs begun at Itek in the United 
States. At Vinten he has applied MTF controls in optical manufac- 
turing while his work with SIRA has kept him informed on the latest 
MTF international studies. He is primarily responsible for the 
original and revised Section 6 (discussed above) and the discussion 
of phase in a following section. 
Dr Roy Welch, Professor in the Department of Geography at the 
University of Georgia, began developing MTF analytic techniques 
while at Itek in the 1960's. In his later work at U.S. Geological 
Survey, he extended his studies into analysis of photographic imagery 
from satellites. He continues to be one of the knowledgeable scientists 
involved with analysis of satellite photography as his many papers 
attest. Welch has written the guidelines for MTF testing of cameras 
for the proposed Section 6 substitution, (2.2). 
3.2 OTF/MTF WORKING GROUP PROGRAM 
STANDARDS 
NATIONAL STANDARDS 
ISP COMMISSION I PROPOSED REVISION OF SECTION 6 
CURRENT CORRELATION OF MTF TESTING ON WIDE-FIELD MAPPING LENSES 
OTF TESTING OF LENSES 
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