PHOTOGRAMMETRIC ENGINEERING 
13 
9 inch by 18 inch picture area can be 
tested. 
The large test camera, shown in 
Figure 5, was manufactured by Con 
solidated Photo Engravers, Equip 
ment Company, and was designed 
primarily for testing special long 
focal length reconnaissance and spot 
ting lenses. It is over 20 feet tall and 
will accommodate lenses up to 100 
inches in focal length and 16 inches 
in diameter. The collimator for this 
camera is placed on a swinging mount 
Fig. 4. Medium size lens test camera. ^ ^ foot deep pit under the cam 
era. The operator rides in the small 
elevator on the left. 
Figure 6 shows the folded collimator which is mounted in the pit. The angu 
lar positions of this collimator can be set by remote control from the operator’s 
elevator. The collimator is shown without its cover. This arrangement makes 
possible testing these heavy lenses in a vertical position, and large cameras in 
any oblique position. Considerable time and expense of flying large aircraft has 
been reduced by means of this apparatus. 
Figure 7 is a picture of the plate holder carriage and control panel. For 
focusing, the plate holder carriage is moved by a slow-motion electric drive. 
Focus positions are read to the nearest .1 mm. from a scale mounted on the 
rear of the camera. A magnified view of the scale and vernier is projected for 
convenient reading by the operator. 
This camera will accommodate either 
plates or film up to 40 inches in 
length. 
All the testing in the laboratory is 
done in accordance with MIL-STD- 
150. This document may be of con 
siderable interest. It can be obtained 
from the U. S. Government Printing 
Office. Instead of being the work of 
any one organization, it represents 
the combined thinking of many lead 
ers in the field of photographic optics 
such as Dr. Gardner, Dr. Pestrecov, 
Dr. Baker, Dr. Washer, Dr. Hop 
kins, Dr. Scott, Mr. Cox, Paul Foote, 
Mr. Kingslake and many others. It 
was very pleasing to work with these 
men in the preparation of this docu 
ment which has already proved its 
value in preparing specifications and 
standardizing test procedures for 
aerial lenses. It is hoped that the 
recently adopted specification of Fig. 5. Large test camera designed primarily 
Commission I of the International f or testing special long focal length reconnais- 
Society of Photogrammetry will prove sance and spotting lenses.