An optical system includes, in order from an object side to an image side, a first lens having negative refractive power, a second lens having negative refractive power, a third lens having negative refractive power, a fourth lens having positive refractive power, an aperture stop, a fifth lens having positive refractive power, a sixth lens having negative refractive power, and a seventh lens. A sign of a temperature coefficient of a refractive index for d-line of at least one of the fourth lens and the fifth lens at 20° C. to 40° C. is negative. A sign of a temperature coefficient of a refractive index for the d-line of at least one of the third lens and the sixth lens at 20° C. to 40° C. is positive.
OPTICAL SYSTEM, IMAGE PICKUP APPARATUS, ON-BOARD SYSTEM, AND MOVABLE APPARATUS
2025-06-05
Patent
Electronic Resource
English
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