Photographic optical system

1. A photographic optical system comprising, in an order from an object side to an image side:

a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens; wherein the photographic optical system further meets the following conditions (1)˜(7):

10< f 1/ f< 15  (1);

20< f 2/ f< 80  (2);

0.5< f 3/ f< 1.5  (3);

−2.5< f 4/ f<− 0.5  (4);

−10< f 5/ f<− 2  (5);

0.2< f 6/ f< 1.2  (6);

−2.5< f 7/ f<− 0.4  (7);

where,

f1: The focal length of the first lens;

f2: The focal length of the second lens;

f3: The focal length of the third lens;

f4: The focal length of the fourth lens;

f5: The focal length of the fifth lens;

f6: The focal length of the sixth lens;

f7: The focal length of the seven lens;

f: The focal length of whole photography optical system.

2. The photographic optical system as described in claim 1 further meeting the following conditions (1a)-(7a):

30 mm< f 1<80 mm  (1a);

50 mm< f 2<100 mm  (2a);

2 mm< f 3<5 mm  (3a);

−10 mm< f 4<−2 mm  (4a);

−30 mm< f 5<−10 mm  (5a);

1 mm< f 6<5 mm  (6a);

−5 mm< f 7<−1.5 mm  (7a).

3. The photography optical system as described in claim 2 , wherein the first lens is a positive lens, and the object side surface of the first lens is concave.

4. The photography optical system as described in claim 2 , wherein the seventh lens is a negative lens.

5. The photography optical system as described in claim 4 , wherein the image side surface of the seventh lens has at least one point of inflection and one stagnation point.

6. The photographic optical system as described in claim 1 further meeting the following conditions (1b)-(7b):

1.50< n 1<1.55  (1b);

1.50< n 2<1.55  (2b);

1.50< n 3<1.55  (3b);

1.60< n 4<1.70  (4b);

1.60< n 5<1.70  (5b);

1.50< n 6<1.55  (6b);

1.50< n 7<1.55  (7b);

where,

n1: The refractive power of the first lens;

n2: The refractive power of the second lens;

n3: The refractive power of the third lens;

n4: The refractive power of the fourth lens;

n5: The refractive power of the fifth lens;

n6: The refractive power of the sixth lens;

n7: The refractive power of the seven lens.

7. The photography optical system as described in claim 1 further meeting the following conditions (1c)-(7c):

40< v 1<60  (1c);

40< v 2<60  (2c);

40< v 3<60  (3c);

15< v 4<30  (4c);

15< v 5<30  (5c);

40< v 6<60  (6c);

40< v 7<60  (7c);

where,

v1: Abbe number of the first lens;

v2: Abbe number of the second lens;

v3: Abbe number of the third lens;

v4: Abbe number of the fourth lens;

v5: Abbe number of the fifth lens;

v6: Abbe number of the sixth lens;

v7: Abbe number of the seven lens.

8. The photography optical system as described in claim 1 , wherein the first lens and the second lens meet following condition:

F 12>50 mm or f 12<−50 mm;

where,

f12: The combination focal length of the first lens and the second lens.

9. The photography optical system as described in claim 1 further meeting the following conditions:

TTL< 5.5 mm;

78°< FOV< 88°;

where,

TTL: The distance from the object side surface to the imaging surface of the first lens;

FOV: The biggest view angle range of the photographical optical system.

10. The photography optical system as described in claim 1 further including a stop installed on the object side surface of the third lens.