inoperative. 
only minimal 
secured high 
Photographic 
b. 
Ce 
Aerial Camera 
the vegetation is not discernible. 
KA-2 aerial camera (U.S. military surplus) has a 9-inch X 9-inch format 
12-inch foral length and features an f.3.8 lens and rapidyne shutter with 
speeds to 1/750 seconds. The A-9A film magazine was modified for light 
indicators when film supply was expended and when vacuum pressure was 
The KA-2 lens resolves approximately 40 lines per mm with 
fall-off in the corners of the photo. We have consistently 
quality imagery with the KA-2 12-inch aerial camera. 
Techniques 
Film exposure, cloud cover, time of day, elevation, and photo overlap 
(stereo or nonstereo) are important parameters which vary by resource to 
be photographed. 
1. Film exposure 
Croplands require the precise exposure as indicated on the 
light meter. 
Rangelands are best discerned by slight underexposure. 
Forestlands require slight overexposure. 
2. Cloud cover 
Low cloud cover is to be avoided at all times. 
a. 
b. Clear skies are needed for crop and grass rangelands photo- 
graphy. 
c. High overcast skies are highly useful and desirable for 
brush, rangelands, and forestland photography. 
Low clouds affect the photography ín two ways. The clouds themselves 
will obscure the ground, and the shadows are badly underexposed so that 
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