Zoom lens
The present disclosure relates to optical lens, and provides a zoom lens including, from an object side to an image side in sequence: a first lens having a negative refractive power, a second lens having a positive refractive power, a third lens having a negative refractive power, a fourth lens having a positive refractive power, a fifth lens group having a negative refractive power; distances between adjacent two of the first lens, the second lens, the third lens, the fourth lens and the fifth lens group are variable in the direction of the optical axis; the fifth lens group including a fifth lens having a positive refractive power and a sixth lens having a negative refractive power; wherein the zoom lens satisfies conditions of: f_Tele/f_Wide>1.8; −1.85≤f3/f2≤−1.20; and 2.00≤f4/f2≤3.00.
1. A zoom lens comprising, from an object side to an image side in sequence: a first lens having a negative refractive power, a second lens having a positive refractive power, a third lens having a negative refractive power, a fourth lens having a positive refractive power, a fifth lens group having a negative refractive power; wherein
distances between adjacent two of the first lens, the second lens, the third lens, the fourth lens and the fifth lens group are variable in the direction of an optical axis;
the fifth lens group comprises a fifth lens having a positive refractive power and a sixth lens having a negative refractive power;
the zoom lens satisfies conditions of:
f _Tele/ f _Wide>1.8; (1)
−1.85≤ f 3/ f 2≤−1.20; and (2)
2.00≤ f 4/ f 2≤3.00; (3)
where
f_Wide denotes a focal length of the zoom lens at the wide angle end;
f_Tele denotes a focal length of the zoom lens at the telephoto end;
f2 denotes a focal length of the second lens;
f3 denotes a focal length of the third lens; and
f4 denotes a focal length of the fourth lens.
2. The zoom lens according to claim 1 , wherein the zoom lens further satisfies a condition of:
−3.20≤ f 1 /f 2≤−2.50; (4)
where
f1 denotes a focal length of the first lens; and
f2 denotes a focal length of the second lens.
3. The zoom lens according to claim 1 , wherein the zoom lens further satisfies a condition of:
−5.00≤ fG 5/ f 2≤−2.50; and (5)
−3.10≤ f 5/ f 6≤−2.00; (6)
where
f2 denotes a focal length of the second lens;
fG5 denotes a combined focal length of the fifth lens group;
f5 denotes a focal length of the fifth lens; and
f6 denotes a focal length of the sixth lens.
4. The zoom lens according to claim 1 , wherein the zoom lens further satisfies a condition of:
4.78≤ LB _Tele/ LB _Wide≤6.20; (7)
where
LB_Wide denotes an on-axis distance from an image-side surface of the sixth lens to an image surface at the wide angel end; and
LB_Tele denotes an on-axis distance from an image-side surface of the sixth lens to an image surface at the telephoto end.
5. The zoom lens according to claim 1 , wherein the zoom lens further satisfies a condition of:
76.00≤ν1≤82.00; (8)
58.00≤ν2≤78.00; and (9)
76.00≤ν6≤82.00; (10)
where
ν1 denotes an abbe number of the first lens L 1 ;
ν2 denotes an abbe number of the second lens L 2 ; and
ν6 denotes an abbe number of the sixth lens L 6 .