Showing papers on "Aerial image published in 1967"

Holograms of the aerial image of a lens

Abstract: Wave front reconstruction imaging technique for hologram production of aerial image of lens

The Evaluation of the Modulation Transfer Function of Photographic Materials. The Interaction of the Modulation Transfer Function of the Instruments, and of the Characteristic Curve

Abstract: The smaller the signal-to-noise-ratio can be kept in the measurement of the modulation transfer function (MTF) of photographic material. the more care must be taken to eliminate systematic errors. Exact knowledge of the spatial exposure distribution in the sample (the so-called aerial image) and of the optical properties of the microdensitometer are essential. Four methods (including two-beam interferometry) of the measurement of the aerial image are presented and discussed. The rigorous method of correcting the interference of the optical transfer characteristic of the microdensitometer is presented taking into account the non-linearity of the photographic process. and the range of validity of a commonly applied heuristic method is investigated. Finally twa methods of eliminating the characteristic curve in order to find the effective exposure are compared and examples of their application are given.

Telescopic reflex view-finder

Abstract: 1,077,059. Camera view-finders. PENTACON DRESDEN KAMERA-UND KINOWERKE VEB. April 27, 1965, No.17726/65. Headings G2A, G2E and G2J. A telescopic reflex view-finder comprises a beam splitter 3, a lens 7 forming an image on the plane surface of a lens 9 which is cemented to a prism 10 and a reversing arrangement 11 and 12 which produces an aerial image in an aperture 14 of a plate 15. It is stated that since the images are not produced on surfaces which can receive dust particles, no distortion of the image can occur by the action of such particles.