REPORT OF COMMISSION V GV-97 
BIBLIOGRAPHY 
Donaldson, D. C., ''Camera for Stereoscopic Photography of Anterior Segment." Arch. Ophth., 43: 
1083-1087, 1950. 
Donaldson, D. C., “A Stereo-camera for Medical Photography.” Medical & Biological Illustration, 
5: 209-216, 1955. 
Linssen, E. F., "Stereo Photography in Practice," London, Fountain Press, 1952. 
Morgan, W. D., and Lester, H. M., ‘Stereo Realist Manual,” New York, Morgan & Lester, 1954. 
A New Stereoscopic Camera for Extreme Close-ups. Instrument News, Perkin-Elmer Corp., Nor- 
walk, Connecticut, p. 6, Vol. 6, No. 3. 
Macrophotogrammetry with the 
Donaldson Stereo-Camera’ 
GOMER T. MCNEIL, President, Photogrammetry, Inc., 
Silver Spring, Maryland 
INTRODUCTION 
To Donaldson Stereo-Camera! is being utilized primarily in the fields of 
ophthalmology and pathology for qualitative analyses. The purpose of this 
report is to demonstrate and to determine the quantitative capabilities of a 
camera designed specifically for the interpretation of stereoscopic photographs 
of the eye and of gross specimens. 
The only Donaldson Stereo-Camera conveniently available for metrical 
analysis was located at the Armed Forces Institute of Pathology, Washington, 
D. C. which undoubtedly is one of the most modern and well equipped labora- 
tories of its kind in the world. The responsible officials of the Institute encour- 
aged the metrical analysis of the Donaldson Stereo-Camera. A request was 
made to the Institute for a one day loan of the camera for the purpose of making 
an elaborate calibration. The loan was not approved for the very legitimate rea- 
son that the camera must remain in a continual stand-by condition for emer- 
gencies and other unscheduled demands. 
Inasmuch as the camera could not be removed from the Institute, it was 
decided to conduct the analysis in a more simplified manner so that technicians 
not versed in the science of photogrammetry can duplicate the following proce- 
dure. 
CAMERA CALIBRATION 
Prepare a glass plate grid of transparent lines on a black background. The 
interval between lines is 5 millimeters. Place the grid, with emulsion side up, 
on a trans-illuminator (Figure 1). 
The scale indicator on the side of the camera is set opposite the index 1 
(ratio of image size to object size). The angular orientation of the camera is 
adjusted and locked when the optical axes are perpendicular (or nearly so) 
* This is one of the papers included in the Report of the Reporter for U.S.A. Commission V of 
the International Society of Photogrammetry.