Imaging lens, optical apparatus including imaging lens and method for manufacturing imaging lens

An imaging lens comprising, in order from an object side:

• a first lens group having positive refractive power;
• a second lens group having positive refractive power;
• and
• a third lens group having negative refractive power,
• said first lens group including a negative meniscus lens with a concave surface directed to an image side disposed closest to the object,
• an aperture stop being disposed between said first lens group and said second lens group,
• said first lens group and said second lens group moving to the object side with changing a distance between said first lens group and said second lens group upon focusing on a near-distance object point from an infinite-distance object point, and
• said imaging lens satisfying the following conditional expression:
• 0.5≦(−β)
• where β denotes a shooing magnification upon focusing on the nearest object point.

An imaging lens comprising, in order from an object side:

• a first lens group having positive refractive power;
• a second lens group having positive refractive power;
• and
• a third lens group having negative refractive power,
• said first lens group including a negative meniscus lens with a concave surface directed to an image side disposed closest to the object,
• an aperture stop being disposed between said first lens group and said second lens group,
• said first lens group and said second lens group moving to the object side with changing a distance between said first lens group and said second lens group upon focusing on a near-distance object point from an infinite-distance object point, and
• said first lens group including, in order from the object side, a front group having negative refractive power in combination including a negative lens with a concave surface directed to the image side and a positive lens, and a rear group having positive refractive power in combination disposed on the image side of said front group.

An imaging lens comprising, in order from an object side:

• a first lens group having positive refractive power;
• a second lens group having positive refractive power;
• and
• a third lens group having negative refractive power,
• said first lens group including a negative meniscus lens with a concave surface directed to an image side disposed closest to the object,
• an aperture stop being disposed between said first lens group and said second lens group,
• said first lens group and said second lens group moving to the object side with changing a distance between said first lens group and said second lens group upon focusing on a near-distance object point from an infinite-distance object point, and
• said third lens group being composed of four or less lenses.

A method for manufacturing an imaging lens comprising, in order from an object side:

• a first lens group having positive refractive power;
• a second lens group having positive refractive power;
• and
• a third lens group having negative refractive power,
• the method comprising steps of:
• disposing a negative meniscus lens with a concave surface directed to an image side on the side closest to the object of said first lens group;
• disposing an aperture stop between said first lens group and said second lens group;
• disposing said first lens group and said second lens group for moving to the object side in such a manner that upon focusing on a near-distance object point from an infinite-distance object point a distance between said first lens group and said second lens group varies;
• applying an antireflection coating to at least one optical surface among the first lens group through the third lens group such that the antireflection coating includes at least one layer formed by a wet process;
• and
• providing said optical surface with a concave surface viewed from said aperture stop.

A method for manufacturing an imaging lens comprising, in order from an object side:

• a first lens group having positive refractive power;
• a second lens group having positive refractive power;
• and
• a third lens group having negative refractive power,
• the method comprising steps of:
• disposing a negative meniscus lens with a concave surface directed to an image side on the side closest to the object of said first lens group;
• disposing an aperture stop between said first lens group and said second lens group;
• disposing said first lens group and said second lens group for moving to the object side in such a manner that upon focusing on a near-distance object point from an infinite-distance object point a distance between said first lens group and said second lens group varies, and
• satisfying the following conditional expression:
• 0.5<(−β)
• where β denotes a shooing magnification upon focusing on the nearest object point.