- 5 - 
Lens-Film Resolution 
45 lines/mm AWAR on Aerecon Plus-X 
film, high-contrast targets 
Format 
-- 9" x 9" 
Film Capacity 
% 
390 ft. of 9- 1 / 2" film, standard base 
IMC 
0. 1 to 0. 8 inches/second. The IMC is 
infinitely variable within the range, in 
accordance with the V/H signal. 
IMC Mode 
Film adheres by vacuum to a platen, which 
is driven by a smooth friction-type trans 
mission 
Platen 
Equipped with reseau 
Operational Modes 
1) Autocycle with IMC 
2) Pulse, with or without IMC 
Maximum Cycling Rate 
30 frames/minute 
Shutte r 
Between-the-lens, drawer-type Rapidyne 
Shutter Speed Range 
1/50 to 1/800 second, effective 
Synchronizer 
Controls shutter speed and provides mid 
point of exposure pulse. 
Automatic Exposure Control 
Self-contained sensor. Shutter speed and 
iris diaphragm control exposure 
Fiducials 
Flashed at midpoint of exposure 
Data Recording 
Verticality deviation, CRT display, frame 
count, lens calibrated focal length, lens 
serial number, lens type, camera type 
number, camera serial number, vacuum 
indication 
The Geocon IV Lens 
The 6-inch f/5 Geocon IV lens (see Figure 2) has been specifically designed for 
high resolution, zero distortion, and even illumination over the 9" x 9" image 
field. The design allows color and infrared emulsions to be used without change