15. Forkey, R.E. 
Womble, D.A. 
United States 
UNIQUE LENS DESIGN FOR 
MULTISPECTRAL PHOTOGRAPHIC CAMERAS 
The Itek Multispectral Photographic Facility (MPF), originally developed for Earth Resource Experimental 
Package (S-190) as part of NASA’s Skylab Program, is a high resolution metric camera array that 
simultaneously takes six precisely matched photographs across the 0.4 to 0.9 micrometer spectral region. Each 
photograph records information in specific portions of the visble and photographic infrared light spectrum. 
The lens objectives are six inch focal length, F/2.8 and cover a 70 millimeter square basic design (i.e. same glass 
types, radii, element central thicknesses) which may be used for all of the discrete color channels. This requires, 
in addition to the high degree of monochromatic aberration and distortion correction required in the basic 
design, that the axial and lateral chromatic aberrations as well as the chromatic variation of aberration be very 
tightly constrained. In this way performance can be simultaneously optimized for the relatively narrow spectral 
regions of each channel. The lens may be ‘tuned’ during the assembly and text cycle by varying two airspaces 
so that not only are the resolution planes set on the rear of the reseaux but also the scale factors of each of the 
six cameras are matched within a total range of five microns in image height. The paper being presented is 
concerned primarily with the lens design and analysis of the camera objectives. 
16. Gerencsér, M.G. 
Hungary 
COMPARATIVE MTF TESTS OF ENTIRE AERIAL 
PHOTOGRAPHIC SYSTEM IN B & W AND COLOR 
Comparative MTF tests of the entire aerial photographic system were made at four different flight heights from 
a painted knife edge test pattern D max = 1,25, D min- 0,75, Contrast = 0,51. The edge was normal to the flight 
line. Kodak Plus X and Ektachrome MS were used at the same meteorological and technical conditions. After 
having developed at sensitometrically controlled circumstances the patterns were recorded by a Hilger 
Recording Microphotometer with 1 x 80 micron slit. The color photographs were measured in blue, green and 
red spectrum, the average sensitivity of the instrument had to be increased with the joining of a Hewlett- 
Packard Micro Volt-Ammeter as an amplifier. 
The MTF's were calculated by EGA analysis taking into account the MTF of the microphotometer. 
The image modulations were related to the aerial image of the pattern and to the field modulation as well and 
the latter seemed to be more impressive to express the degradation of the image contrast by changing of flight 
height between 700-2200 m which came to 20% at 0 frequency in the given conditions. 
The three MTF's of color film were interpreted in detail. 
The standard deviation of the EGA Process calculated from four observations was found 2-495, the maximal 
deviation was 6%. 
The experiments have shown that the efficiency of the entire system has increased with the given color film in 
the respect of detail rendition as well and the granularity of the color film was found nearly half value of the 
b & w film. 
17. Ghosh, S.K. 
Martucci, L.M. 
United States 
IMAGE QUALITY EFFECTS ON IMAGE GEOMETRY 
OF A METRIC CAMERA 
A study of the Image Quality Effects on Image Measurement in an aerial mapping camera (Zeiss RMK reseau) 
is reported. A laboratory experiment was designed and conducted to investigate the effects of resolution,