Anamorphic lens

1. A super wide-angle large aperture anamorphic lens comprising:

a cylindrical lens group and a spherical lens group in an arrangement of an object side to an image side; wherein the cylindrical lens group comprises, from the object side to the image side, a first lens ( 1 ), a second lens ( 2 ), a third lens ( 3 ), and a fourth lens ( 4 ) in a sequential order; wherein the first lens ( 1 ) and the second lens ( 2 ) comprise negative optical power cylindrical lenses, wherein the third lens ( 3 ) and the fourth lens ( 4 ) comprise positive optical power cylindrical lenses; wherein the spherical lens group comprises a fifth lens ( 5 ), a sixth lens ( 6 ) . . . to Nth lens, where N is greater than or equal to a natural number of 10, in sequence along the direction of the optical path pointing to the image side;

a power distribution of the lenses constituting the cylindrical group and the spherical group may satisfy the following relationship:

23.6 mm< f (1-N) Y< 24.4 mm;

17.6 mm< f (1-N) X< 19.2 mm;

1.20< f (1-N) Y/f (1-N) X< 1.40;

3.50< f 4 Y/f (2-3) X< 4.20;

wherein a X direction is a curvature direction of the first lens, and a Y direction is the other direction that is 90 degrees to the curvature direction of the first lens, wherein the subscript number off comprises a number of each lens, wherein f (M-N) Y comprises a combined optical focal length of the total (N−M+1) lens in the Y direction from a Mth lens to a Nth lens, wherein f (M-N) X comprises a combined optical focal length of the total (N−M+1) lens in the X direction from the Mth lens to the Nth lens, wherein M comprises a natural number greater than or equal to 1 and less than N.

2. The according to claim 1 , wherein the spherical lens group comprises a fifth lens ( 5 ), a sixth lens ( 6 ), a seventh lens ( 7 ), the eighth lens ( 8 ), the ninth lens ( 9 ), the tenth lens ( 10 ), the eleventh lens ( 11 ), the twelfth lens ( 12 ) and the thirteenth lens ( 13 ).

3. The super wide-angle large aperture anamorphic lens according to claim 2 , wherein the first lens ( 1 ) comprises a front stationary group ( 14 ), wherein the second lens ( 2 ) to the sixth lens ( 6 ) comprise an inner focus group ( 15 ), and the seventh lens ( 7 ) to the thirteenth lens ( 13 ) comprise as a rear stationary group ( 16 ); wherein a power distribution of the front stationary group ( 14 ), the inner focus group ( 15 ) and the rear stationary group ( 16 ) satisfies the following relationship:

−3.10< f 1 X/f (1-13) X<− 2.70;

−2.10< f (2-6) Y/f (1-13) Y<− 1.60;

−10.20< f (2-6) X/f (1-13) X<− 9.20;

2.40< f (7-13) X/f (1-13) X< 2.80;

wherein a X direction is a curvature direction of the first lens, and a Y direction is the other direction that is 90 degrees to the curvature direction of the first lens, wherein the subscript number off comprises a number of each lens, wherein f (M-N) Y comprises a combined optical focal length of the total (N−M+1) lens in the Y direction from a Mth lens to a Nth lens, wherein f (M-N) X comprises a combined optical focal length of the total (N−M+1) lens in the X direction from the Mth lens to the Nth lens, wherein M comprises a natural number greater than or equal to 1 and less than N.

4. The super wide-angle large aperture anamorphic lens according to claim 3 , wherein the fifth lens ( 5 ), the ninth lens ( 9 ) and the tenth lens ( 10 ) comprise all negative power spherical lens; wherein the sixth lens ( 6 ), the seventh lens ( 7 ), the eighth lens ( 8 ), the eleventh lens ( 11 ), the twelfth lens ( 12 ) and the thirteenth lens ( 13 ) comprise spherical lens with positive power.

5. The super wide-angle large aperture anamorphic lens according to claim 3 , wherein the second lens ( 2 ) and the third lens ( 3 ) are configured to join together.

6. The super wide-angle large aperture anamorphic lens according to claim 3 , wherein the eighth lens ( 8 ) and the ninth lens ( 9 ) are configured to join together.

7. The super wide-angle large aperture anamorphic lens according to claim 1 , wherein the generatrix of the fourth lens ( 4 ) is perpendicular to the generatrix of the third lens ( 3 ).

8. The super wide-angle large aperture anamorphic lens according to claim 1 , wherein the second lens ( 2 ) and the third lens ( 3 ) are configured to join together.

9. The super wide-angle large aperture anamorphic lens according to claim 1 , wherein the eighth lens ( 8 ) and the ninth lens ( 9 ) are configured to join together.

10. The super wide-angle large aperture anamorphic lens according to claim 1 , wherein the tenth lens ( 10 ) and the eleventh lens ( 11 ) are configured to join together.

11. The super wide-angle large aperture anamorphic lens according to claim 1 , comprises a length less than 130 mm, and a front end being matched with a 67 mm general filter.

12. The super wide-angle large aperture anamorphic lens according to claim 1 , comprises a focal length in the Y direction of 24.4 mm, a focal length in the X direction of 18.3 mm, and an aperture of 2.8.

13. The ultra-wide-angle large-aperture anamorphic lens according to claim 1 , comprises a mass less than 750 g.

14. The super wide-angle large aperture anamorphic lens according to claim 1 , wherein the tenth lens ( 10 ) and the eleventh lens ( 11 ) are configured to join together.

15. The super wide-angle large aperture anamorphic lens according to claim 1 , comprises a length less than 130 mm, and a front end being matched with a 67 mm general filter.

16. The super wide-angle large aperture anamorphic lens according to claim 1 , comprises a focal length in the Y direction of 24.4 mm, a focal length in the X direction of 18.3 mm, and an aperture of 2.8.

17. The ultra-wide-angle large-aperture anamorphic lens according to claim 1 , comprises a mass less than 750 g.