Optical system

Details Optical system Optical system

1978-09-07

1980-05-20

Griffin, Donald A.

354 42, 354196, 354273, G03B 708, G03B 1302, G03B 902

Patent

active

042036615

ABSTRACT:
In an optical system having a lens with adjustable focal length, an adjustable aperture plate, and a light-meter device attached to the aperture plate adjustment device, apparatus for connecting the focal-length adjustment device so that the aperture opening is limited by the focal length adjustment device. Additionally, a signalling device emits a signal of the aperture opening defined by the focal-length adjusting device is smaller than the opening if the aperture plate controlled by the light-meter device. In another embodiment an additional variable aperture is located in front of the light-meter device and the adjustment device for this additional aperture is also connected to the focal-length adjustment device.

REFERENCES:
patent: 3127809 (1964-04-01), Denk
patent: 3541941 (1970-11-01), Barr et al.
patent: 3587431 (1971-06-01), Holler
patent: 3605596 (1971-09-01), Vockenhuber et al.
patent: 4064520 (1977-12-01), Freudenschuss et al.
1960 Leica Photography, vol. 13, No. 3, One Scale, Many Uses, pp. 28-29.
1961 Leica Photography, vol. 14, No. 4, Leica School Notebook, pp. 14-15.

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