Reflex camera with a built-in exposure metering apparatus

Details Reflex camera with a built-in exposure metering apparatus Reflex camera with a built-in exposure metering apparatus

1976-09-08

1978-08-22

Hix, L. T.

354 56, G03B 700

Patent

active

041092570

ABSTRACT:
In a reflex camera having a penta prism positioned in the view-finder thereof, there is provided a glass member having a reflactive index equal to or larger than that of the penta prism and positioned in intimately contacting relation with the exit surface of said penta prism to utilize that portion of a view-finder image forming light beam which is directed to the exit surface of said penta prism after successive reflection from the two roof surfaces, the front reflection surface and again the roof surfaces of the penta prism such light beam portion would be otherwise subject to the total reflection from the exit surface in vain in measuring the light at a central portion of the view-finder image as well as at any portions outside thereof. In this way it being made possible to operate the camera selectively in a spot-metering mode or overall field of view light metering mode by the use of a single light value sensing means without causing the reduction of quality of the view-finder image.

REFERENCES:
patent: 3451323 (1969-06-01), Uno et al.
patent: 3575095 (1971-04-01), Keck

Affiliated with

Also associated with

Rating

Reflex camera with a built-in exposure metering apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Reflex camera with a built-in exposure metering apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reflex camera with a built-in exposure metering apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1562043