The Boston Camera was a prototype airborne photo reconnaissance camera manufactured for the United States Air Force

United States Air Force

The United States Air Force is the aerial warfare service branch of the United States Armed Forces and one of the American uniformed services. Initially part of the United States Army, the USAF was formed as a separate branch of the military on September 18, 1947 under the National Security Act of...

 by Boston University

Boston University

Boston University is a private research university located in Boston, Massachusetts. With more than 4,000 faculty members and more than 31,000 students, Boston University is one of the largest private universities in the United States and one of Boston's largest employers...

 in 1951 and tested on the Convair B-36

Convair B-36

The Convair B-36 "Peacemaker" was a strategic bomber built by Convair and operated solely by the United States Air Force from 1949 to 1959. The B-36 was the largest mass-produced piston engine aircraft ever made. It had the longest wingspan of any combat aircraft ever built , although there have...

 and the C-97 Stratofreighter

C-97 Stratofreighter

The Boeing C-97 Stratofreighter was a long range heavy military cargo aircraft based on the B-29 bomber. Design work began in 1942, with the prototype's first flight being on 9 November 1944, and the first production aircraft entered service in 1947. Between 1947 and 1958, 888 C-97s in several...

. The model carried on the first ERB-36D (44-92088)

Convair B-36 variants

Convair B-36 variants began in 1941 with the XB-36 to meet the strategic needs of the US Army Air Forces; then later becoming United States Air Force with its Strategic Air Command. In 1948, the B-36 immediately becoming a mainstay of the American nuclear deterrent. It underwent a number of design...

 had a 6096 mm (240 in) focal length

Focal length

The focal length of an optical system is a measure of how strongly the system converges or diverges light. For an optical system in air, it is the distance over which initially collimated rays are brought to a focus...

, which was achieved using a series of lenses

Lens (optics)

A lens is an optical device with perfect or approximate axial symmetry which transmits and refracts light, converging or diverging the beam. A simple lens consists of a single optical element...

 and mirrors. The lens had an f/8 stop

F-number

In optics, the f-number of an optical system expresses the diameter of the entrance pupil in terms of the focal length of the lens; in simpler terms, the f-number is the focal length divided by the "effective" aperture diameter...

 and used a 1/400 second shutter speed

Shutter speed

In photography, shutter speed is a common term used to discuss exposure time, the effective length of time a camera's shutter is open....

, and could photograph a golf ball from an altitude of 45,000 feet. The camera used 18x36 inch (45x90 cm) negatives

Negative (photography)

In photography, a negative may refer to three different things, although they are all related.-A negative:Film for 35 mm cameras comes in long narrow strips of chemical-coated plastic or cellulose acetate. As each image is captured by the camera onto the film strip, the film strip advances so that...

. The camera was used operationally in Eastern Europe. It was given to the Air Force Museum

National Museum of the United States Air Force

The National Museum of the United States Air Force is the official museum of the United States Air Force located at Wright-Patterson Air Force Base northeast of Dayton, Ohio. The NMUSAF is the world's largest and oldest military aviation museum with more than 360 aircraft and missiles on display...

 in 1964, along with a contact print of a golf ball on a course.

The Boston Camera is currently displayed at the National Museum of the US Air Force in Dayton, Ohio.

From the display placard:

This camera, manufactured for the US Air Force by Boston University in 1951, is the largest aerial camera ever built. It was installed in an RB-36D in 1954 and tested for about a year. Later it was used in a C-97 aircraft flying along the air corridor through communist East Germany to Berlin, but a 10,000 ft (3,000 m) altitude restriction imposed by the communists made the camera less useful than at a higher altitude. It was also used on reconnaissance missions along the borders of Eastern European nations. The camera made an 18 x 36 inch negative and was so powerful a photo interpreter could detect a golf ball from an altitude of 45,000 feet (14,000 m). Dr. James Baker

James Gilbert Baker

James Gilbert Baker was an American astronomer and designer of optics systems.-Biography:He was born in Louisville, Kentucky to Jesse B. Baker and Hattie M. Stallard, the fourth child of that couple. He attended Louisville duPont Manual High School then majored in mathematics at the University of...

 of Harvard University designed the camera.



Technical Notes:



Shutter: Focal plane, fixed slit, pneumatic drive, electrically tripped.
Shutter Speed: 1/400 sec

Resolution: 20 lines/mm

Weight: 6,500 lbs (3 metric ton

Tonne

The tonne, known as the metric ton in the US , often put pleonastically as "metric tonne" to avoid confusion with ton, is a metric system unit of mass equal to 1000 kilograms. The tonne is not an International System of Units unit, but is accepted for use with the SI...

) (camera and aircraft mount)