Variable magnification optical system, optical apparatus, and method for manufacturing variable magnification optical system
An optical system and optical axis technology, applied in the field of zoom optical system, can solve the problems of poor usability, large changes in the position of the center of gravity of the camera, and increased product weight.
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[0110] Hereinafter, the variable power optical system ZL of a specific example of the above-described embodiment will be described with reference to the drawings. figure 1 , Figure 4 , Figure 7 , Figure 10 , Figure 13 , Figure 16 It is a cross-sectional view showing the structure and power distribution of the variable power optical systems ZL{ZL(1) to ZL(6)} of the first to sixth examples. In each cross-sectional view, the moving direction along the optical axis of each lens group when the magnification is changed from the wide-angle end state (W) to the telephoto end state (T) is indicated by arrows. In addition, the direction of movement of the focus lens group when focusing from infinity to a close object is indicated by arrows together with the words "focusing".
[0111] In these figures ( figure 1 , Figure 4 , Figure 7 , Figure 10 , Figure 13 , Figure 16 ), each lens group is represented by a combination of a symbol G and a number, and each lens is re...
no. 1 Embodiment
[0124] use Figure 1 to Figure 3 and Table 1 to describe the first embodiment. figure 1 It is a figure which shows the lens structure of the variable-power optical system of 1st Example. The variable magnification optical system ZL(1) of the first embodiment includes a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a negative light The third lens group G3 having power, the fourth lens group G4 having positive power, the aperture stop S arranged in the fourth lens group G4, the fifth lens group G5 having negative power, the The sixth lens group G6 having negative refractive power and the seventh lens group G7 having positive refractive power are constituted. In addition, the imaging element 4 having the image plane I is located on the image side of the seventh lens group G7.
[0125] When changing the magnification from the wide-angle end state (W) to the telephoto end state (T), the first lens group G1 ...
no. 2 Embodiment
[0155] use Figure 4 to Figure 6 and Table 2 to describe the second embodiment. Figure 4 It is a figure which shows the lens structure of the variable-power optical system of 2nd Example. The variable power optical system ZL( 2 ) of the second embodiment includes a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, and a negative light 3rd lens group G3 with positive power, 4th lens group G4 with positive power, aperture stop S, 5th lens group G5 with positive power, 6th lens with negative power The group G6, the seventh lens group G7 having negative refractive power, and the eighth lens group G8 having positive refractive power are constituted. In addition, the imaging element 4 having the image plane I is located on the image side of the eighth lens group G8.
[0156] When changing the magnification from the wide-angle end state (W) to the telephoto end state (T), the first lens group G1 and the third to seventh...
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