Exchangeable lenses for use in internal light measuring type sin

Details Exchangeable lenses for use in internal light measuring type sin Exchangeable lenses for use in internal light measuring type sin

1977-02-17

1978-10-03

Griffin, Donald A.

354 60L, 354273, G03B 1700, G03B 902, G03B 700

Patent

active

041187261

ABSTRACT:
Each exchangeable lens in a series of exchangeable lenses for use in single lens reflex cameras comprises a lens barrel including at least one lens and a diaphragm, a fixed index on the outer surface of the lens barrel, a diaphragm setting ring including f-number graduations ranging from a maximum f-number to a minimum f-number of the exchangeable lens, with the ring rotatable to a plurality of positions to align any one of the f-number graduations to an index so as to be set to a desired f-number. A first projection on the ring is spaced a predetermined first distance, common to each exchangeable lens of the series, from the minimum f-number graduation in the rotational direction of the ring. Thus, the amount of rotation of the first projection with the ring set to a desired f-number corresponds to the step-difference between the minimum and the desired f-number. A second projection of the ring is spaced a predetermined second distance from the maximum f-number graduation in the rotational direction of the ring. The second distance is dependent on the value of the maximum f-number of each exchangeable lens of the series of lenses such that the second projection is at a position dependent on the value of the maximum f-number of the exchangeable lens with the ring set to the maximum f-number.

REFERENCES:
patent: 3618502 (1971-11-01), Congrove
patent: 3858225 (1974-12-01), Hasegawa et al.
patent: 3928858 (1975-12-01), Sakurada et al.
patent: 4037235 (1977-07-01), Ueda

Affiliated with

Also associated with

Rating

Exchangeable lenses for use in internal light measuring type sin does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Exchangeable lenses for use in internal light measuring type sin, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Exchangeable lenses for use in internal light measuring type sin will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1804919