Photographic Setup No. 2

Objective

To photograph a succession of atomic moments of an object moving at a velocity exceeding 1000 feet per second.

Equipment

Camera:	Minolta 35mm single lens reflex.
Shutter Speed:	N/A. All lights are turned off and shutter is opened until after bullet is fired. The duration of the flash determines exposure time.
Lens:	35 mm/F 1.4 lens, protected with ultraviolet filter. A close-up tube was used to bring the camera within 4 inches of the center of the field.
Film:	Kodak Recording Film (B&W) ISO1000
Flash Unit:	Honeywell Auto/Strobonar 360 (most commercially available flash units can be used).
	Flash Description and Specifications
	Test Results on Flash Unit (645K PDF document)
Flash Duration for Photographic Setup #2:	1/2000 of a second.
Flash Placement:	Strobonar placed at 45 degree angle, 9 inches from the line of fire, on the right of the camera; that is, facing the oncoming bullet (see diagram below). The strobonar is covered by a cardboard mask having a 1/4 inch hole in the centre.
Backdrop:	Black cardboard, set back four feet from the line of fire.

Arrangement of Equipment

Trigger Circuit

Trigger: The strobonar shutter cord is spliced and lengthened with an electric wire, leaving the two ends loose. One end is tied to a ground post while one strand of the other end is stretched above the post in the path of the bullet. This strand is then knocked down against the post as the bullet passes, completing the circuit and triggering the flash.

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