Abstract
Lenses to be used in taking airplane photographs for topographic surveying must be substantially free from distortion. It is difficult to find objectives satisfactory in this respect and it is shown that in many cases the distortion can be compensated by a plane parallel plate used as an additional component of the lens. The effect of the plane parallel is generally not detrimental to the correction of the other aberrations of the objective. Experimental work is reported which justifies these conclusions.
© 1927 Optical Society of America
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