- 3 - 
3) Two spectroscopic plates exposed with a cone mounted in the 
camera body when compared with cone calibration data prove 
the cone to be mounted free of strain and the calibration 
reliable for the assembled came ra system. 
4) The well-aged KC-1 aluminum platen has been resurfaced such 
that it is now plane over the 9" x 9" format area within 0. 00020" 
(5 microns). Air gauge measurements of the deviation of this 
surface from a true plane are included in the calibration report 
in a form which shows the contour of the surface. 
5) The new altimeter capable of recording altitude to 80, 000 feet 
replaces the previous one. 
These are the features of the KC-1B, now a mechanically and photographi 
cally reliable camera capable of first order mapping accuracy; a camera 
which has produced good black and white photography under a wide 
range of environments. In effect, a dependable workhorse. 
BASIC REQUIREMENTS OF MODERN MILITARY MAPPING CAMERAS 
While in the general case the bulk of work may be done most efficiently and 
inexpensively with a husky workhorse, the more difficult and faster tasks 
will require the capabilities of a racer. For mapping cameras, both 
commercial and military users list among these "greater capabilities" a 
high resolution lens with clean, sharp images, image motion compensation, 
and automatic exposure control. 
The lens should be a fast one - as cartographic lenses are rated - and color 
corrected through the visual and near infrared range, such that it is capable 
of using to advantage the new high speed, high resolution color films which 
have supplied the photogrammetric gains Swanson and Smith have noted in 
their various papers. Distortion for all colors must of course be negligible. 
That these requirements are not impossible to attain is attested by the latest 
modifications of the Wild and Zeiss 6-inch wide angle lenses. 
Military users with their high speed vehicles have long employed both image 
motion compensation (IMC) and automatic exposure control (AEC) in recon 
naissance photography, the former to reduce image blurring and the latter 
to assure correct exposures. With specific consideration for geometric 
problems, there would be no reason why both factors would not be equally 
valuable in improving mapping photography. With these additional requirements 
defined, investigations and research projects naturally followed.