Optical system and optical apparatus including the same

An optical system in which a distance to an optical axis from a position where a paraxial marginal ray enters a lens surface closest to a magnification side is greater than a maximum value of a distance to the optical axis from a position where the paraxial marginal ray enters a lens surface on a reduction side with respect to an intersection point P between the optical axis and a chief paraxial ray, the optical system comprising:

• a first optical element disposed on the magnification side with respect to the point P;
• and
• a second optical element disposed on the reduction side with respect to the point P,
• wherein the first and second optical element satisfy following conditional expressions:
• 30≤νd≤40
• 1.225≤[nd−(14.387/νd)]≤1.276
• 0.4300≤[θgF−(2.9795/νd)]≤0.5010,
• where νd is an Abbe number of the optical element, θgF is a partial dispersion ratio of the optical element for g-line and F-line, and nd is a refractive index of the optical element for d-line, and
• wherein the first optical element disposed on the magnification side with respect to the point P is a negative lens, and the second optical element disposed on the reduction side with respect to the point P is a positive lens.