Lens unit and camera system
AssigneeFUJIFILM Corporation
InventorsRyoko TOMIOKA, Hiroki SAITO
Life of this patent
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Abstract
A lens unit includes a variable magnification optical system provided with a stop that adjusts a light amount and a processor that controls an opening amount of the stop based on information on a magnification change of the variable magnification optical system. In a case where a maximum value and a minimum value of an F-Number in the entire variable magnification region of the variable magnification optical system are respectively Fmax and Fmin and an average value of an F-Number at a wide angle end and an F-Number at a telephoto end of the variable magnification optical system is Fave, the processor is configured to control the opening amount within a range satisfying 3<{(Fmax−Fmin)/Fave}×100<10.
Claims5
A lens unit comprising:
- a variable magnification optical system provided with a stop that adjusts a light amount;
- and
- a processor that controls an opening amount of the stop based on information on a magnification change of the variable magnification optical system, the processor controlling the opening amount within a range satisfying Conditional Expression (la) represented by
- 3
- <
- {
- (
- F
-
- max
- -
- F
-
- min
- )
- /
- Fave
- }
- ×
- 100
- ≤
- 7.09
- (
- 1
-
- a
- )
- in a case where a maximum value of an F-Number in an entire variable magnification region of the variable magnification optical system is Fmax,
- a minimum value of the F-Number in the entire variable magnification region of the variable magnification optical system is Fmin, and
- an average value of an F-Number at a wide angle end and an F-Number at a telephoto end of the variable magnification optical system is Fave.
Dependencies are inferred from the claim text.