Optical system and image pickup apparatus having the same

An image pickup apparatus comprising an optical system and an image pickup element configured to pick up an image formed by the optical system,

• wherein the optical system comprises a plurality of lens units, the plurality of lens units consisting of, in order from an object side to an image side:
• a front lens unit having a positive refractive power;
• and a rear lens unit including a final lens having a positive refractive power,
• wherein the front lens unit includes a first lens having a negative refractive power,
• wherein the front lens unit includes an aspherical lens disposed in the image side of the first lens,
• wherein an interval between the front lens unit and the rear lens unit changes for focusing;
• wherein the following inequality is satisfied,
• 0
• .
• 1
• <
• (
• G
• ⁢
• L
• ⁢
• R
• ⁢
• 1
• +
• G
• ⁢
• L
• ⁢
• R
• ⁢
• 2
• )
• /
• (
• GLR
• ⁢
• 1
• -
• GLR
• ⁢
• 2
• )
• <
• 1
• ⁢
• 0
• .
• 0
• where GLR1 represents a radius of curvature of an object-side surface of the lens having the positive refractive power arranged closest to the image side, and GLR2 represents a radius of curvature on an object-side surface of the lens having the positive refractive power arranged closest to the image side.