Optical system, image pickup apparatus, in-vehicle system, and moving apparatus

A system comprising:

• an aperture diaphragm;
• a first lens configured to be disposed next to the aperture diaphragm on an object side, and to include one or more positive lenses and one or more negative lenses;
• and
• a second lens configured to be disposed next to the aperture diaphragm on an image side, and to include one or more positive lenses and one or more negative lenses,
• wherein following inequalities are satisfied:
• 1.70<Np1<2.10
• 1.70<Np2<2.10
• 1.80<Nn1<2.10
• 1.80<Nn2<2.10
• 0.068≤|Np1−Nn1|<0.18
• 0.065≤|Np2−Nn2|<0.18
• −4.0<f1/f<−1.0
• −2.000<fn1/f<−0.001
• 0.001<fp1/f<2.000
• where Np1 represents a refractive index of a first positive lens closest to the aperture diaphragm in the one or more positive lenses of the first lens, Nn1 represents a refractive index of a first negative lens closest to the aperture diaphragm in the one or more negative lenses of the first lens, Np2 represents a refractive index of a second positive lens closest to the aperture diaphragm in the one or more positive lenses of the second lens, Nn2 represents a refractive index of a second negative lens closest to the aperture diaphragm in the one or more negative lenses of the second lens, f represents a focal length of the system, f1 represents a focal length of a lens closest to the object side in the system, fp1 represents a focal length of the first positive lens, and fn1 represents a focal length of the first negative lens.