EYE - (continued) Resolution Minimum resolution depends upon: (1) retinal location of the image - (resolving power decreases with distance from the fovea); (2) nature of the image - (size, shape, color, illumination and contrast); (3) adequate time for stimulation. Two small objects can be recog-nized as two when their images fall no nearer on the retina than on two non-adjacent cones providing the diffraction patterns are sufficiently separated. See "Experiments in Seeing" by Harry Asher, Basic Books, Inc. (or Fawcett publications paperback). The average eye resolves details subtending 1 minute of arc at the eye (subtending 75 u at 250 mm).

The sensitivity of three color schlieren methods currently used is limited because of diffraction inherently associated with them. A new method has been developed that has the same resolution capabilities as the commonly used black and white schlieren technique. At the same time the new method has sensitivity capabilities approaching that of the black and white technique. The paper illustrates both old and new methods and has photographs to compare sensitivity and resolution capabilities of each.

The photo-optical systems evaluation seminar-in-depth held in Rochester, New York on May 11, 1967 consists of a two day meeting during which 15 technical papers were presented. The seminar was assessed during a lively colloquium at the end of the second day. In this brief review of the seminar, the main advances in instrumentation and analytical techniques will be described. However, the most important task is to attempt to summarize the feelings of the participants and to point out some of the problem areas that this seminar uncovered.

The multi-aperture image dissector has the ability to give simultaneous information on the brightness of spatially separated points of an optical image, due to the multiplicity of dissecting apertures. Several applications for this multiple readout concept have been proposed and demonstrated. Details of systems for edge detection, tracking and use in photogrammetry, incorporating the multi-aperture image dissector, will be given. Possible motion detection and shape recognition schemes will be outlined. A low light level development of the multi-aperture image dissector will be discussed.

RADOT stands for Recording Automatic Digital Optical Tracker. This system comprises a very versatile pedestal guided by a two-channel infrared tracker. it maintains precise tracking at rates approaching 90°/sec., with a payload in excess of 1000 lbs. in addition, fast responding shaft encoders permit a unique digital data recorder to print azimuth, elevation, and time on each frame of two 70 mm cameras running at 360 fps. The RADOT's were designed to provide metric and engineering sequential data on both launch and re-entry vehicles at the Kwajalein Test Site.