Abstract
THIS PAPER explains about the designing procedure of optical systems, the detailed characteristic and the measured accuracy of OT-Scope. Designing the optical systems, measurements of every part except M_1 mirror are determined first by means of construment, and the curvature of the M_1 mirror is obtained by calculation. The Characteristic of OT-Scope are studied by both the theoretical process and the actual measurement. One of the outstanding characteristics of OT-Scope is the equality of the illumination on the image surface, which we cannot find in other lenses. The equality of illumination is proved theoretically, but in actual measurement the illumination on the image surface of the circumference is reduced by 4 per cent. We consider this reduction of illumination quite negligible in case of general photographic photometry, and assume that illumination on the image surface is equal. As for the accuracy of OT-Scope, it was studied by measurement that as the altitudinal measurement in sphere from 20 degrees to 85 degrees altitude of general measured object, the error is no greater than 1 degree, and that as the measurement of sky factor, the error is in 1 per cent. We believe this accuracy is high enough for the general use. The causes of the errors which appear in here, it is considered, depend chiefly upon the mirror's inaccurate curvature in polishing process and the inaccuracy of construction of each system. We have come to conclusion, therefore, that the higher accuracy can be obtained by improving the manufacturing process and the testing method.
