610 mm and operate on 115 mm wide film. They have a sweep angle of 
+ 54° with respect to the nadir. For operation in low Earth orbit, the 
sweep angle would probably be reduced to + 40°. One camera will be 
directed 12^° forward along the flight line and the other 12%° aft to 
provide a stereo B/H ratio of 0.3. The performance of these cameras in 
low Earth orbit is indicated in figure 3. 
Figure 3.—Performance of Apollo panoramic camera 
in low Earth orbit. The resolution required for 
1:25,000 and 1:50,000-scale image maps is indicated. 
In addition the stellar film cameras in the present ARS will be replaced 
by electro-optical mosaic focal plane star sensors with an integral 
micro computer. This will eliminate the tedious task of measuring star 
photographs and will provide an increased accuracy of + 2 arcseconds for 
each of the three LFC attitude angles. 
As shown in figure 4, the three cameras will be mounted on a bridge 
structure which can be carried in the cargo bay as a payload of oppor 
tunity on any Shuttle missions having a significant Earth-viewing time 
line (NASA, 1979). 
Command/Monitor 
Interface Box 
Figure 4.—The Large Format Camera (LFC) with the stellar attitude 
reference package, the two Apollo panoramic cameras, and the 
necessary control units mounted on a bridge structure in the 
Shuttle cargo hay. 
The mapping capability of the LFC - pan - stellar combination is given 
in Table 4.