Zoom lens and imaging apparatus

An imaging apparatus having a zoom lens and an imaging device for converting an optical image formed by the zoom lens into an electrical signal, characterized in that:

• the zoom lens is composed by arranging, in the order from an object side, a first lens group having a weak refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens group having a positive refractive power, and is configured to perform zooming by moving the second lens group and the third lens group;
• the first lens group is composed by arranging, in the order from the object side, a single lens having a negative refractive power, a prism for folding an optical path, and a single lens having a positive refractive power;
• and the second lens group is composed of one single lens having a negative refractive power, and satisfies a conditional formula (1) t2/fw<0.4, where t2 represents the center thickness of the single lens having a negative refractive power constituting the second lens group and fw represents the focal length of a whole lens system at a wide-angle position.

An imaging apparatus having a zoom lens and an imaging device for converting an optical image formed by the zoom lens into an electrical signal, characterized in that:

• the zoom lens is composed by arranging, in the order from an object side, a first lens group having a weak refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens group having a positive refractive power, and is configured to perform zooming by moving the second lens group, the third lens group, and the fourth lens group;
• the first lens group is composed by arranging, in the order from an object side, a single lens having a negative refractive power, a prism for folding an optical path, and a single lens having a positive refractive power;
• and the second lens group is composed of one single lens having a negative refractive power, and satisfies a conditional formula (1) t2/fw<0.4, where t2 represents the center thickness of the single lens having a negative refractive power constituting the second lens group and fw represents the focal length of a whole lens system at a wide-angle position.

An imaging apparatus having a zoom lens and an imaging device for converting an optical image formed by the zoom lens into an electrical signal, characterized in that:

• the zoom lens is composed by arranging, in the order from an object side, a first lens group having a weak refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens group having a positive refractive power, and is configured to perform zooming by moving the second lens group and the third lens group;
• the first lens group is composed by arranging, in the order from the object side, a lens prism having a negative refractive power for folding an optical path, and a single lens having a positive refractive power;
• and the second lens group is composed of one single lens having a negative refractive power, and satisfies a conditional formula (1) t2/fw<0.4, where t2 represents the center thickness of the single lens having a negative refractive power constituting the second lens group and fw represents the focal length of a whole lens system at a wide-angle position.

An imaging apparatus having a zoom lens and an imaging device for converting an optical image formed by the zoom lens into an electrical signal, characterized in that:

• the zoom lens is composed by arranging, in the order from an object side, a first lens group having a weak refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens group having a positive refractive power, and is configured to perform zooming by moving the second lens group, the third lens group, and the fourth lens group;
• the first lens group is composed by arranging, in the order from an object side, a lens prism having a negative refractive power for folding an optical path, and a single lens having a positive refractive power;
• and the second lens group is composed of one single lens having a negative refractive power, and satisfies a conditional formula (1) t2/fw<0.4, where t2 represents the center thickness of the single lens having a negative refractive power constituting the second lens group and fw represents the focal length of a whole lens system at a wide-angle position.