6.10 Data Reduction: Reduction techniques involving the use of a 
computer are recommended, although close attention must be given 
to ensure that the computational procedures yield consistent and 
reliable results. 
6.11 Final Results: Reports should include: date of photography, 
camera system and photographic parameters, processing procedures, 
analysis techniques/equipment, format location/orientation of target, 
methods of data reduction, and plots of modulation versus spatial 
frequency. 
6.12 References: 
1. Dimensions, Tolerances and OTF Characteristics of the Sira 
Group 50 mm. Plano Convex Test Lens. Williams, T.L. Sira Report 
R 456. 
2. A Light Source of Sensitometry of Aerial Films.  Carman, P.D. 
Photographic Sciences and Engineering, 13,6. Nov-Dec 1969, 
3. The Reproducibility of MTF Measurements. (Reports on compara- 
tive measurements of six inch wide angle lens by eight laboratories. 
Not yet released for general distribution) Sira Institute Report. 
4. Recommendations for the Measurement of the Optical Transfer 
Function of Optical Devices. British Standard BS 4779:1971. 
British Standards Institution, London. 
5. Optícal Transfer Function: Symbols, Definitions, Mathematical 
Relations. DIN 58 185. German Standards Committee, Pforzheim, 
Germany. : o 
6. Photogrammetric Image Evaluation Techniques. R. Welch. ISP | 
Com I Symposium, August 1974, Stockholm, Sweden.