Optical system of optical anti-shake telescope

Abstract

The utility model discloses an optical system of an optical anti-shake telescope. An objective lens group, a prism group and an eyepiece group are sequentially arranged from an object side to an image side along the direction of an optical axis. Wherein the objective lens group comprises a first objective lens, a second objective lens, a third objective lens, a focusing lens and an anti-shake lens; the prism group comprises a half pentaprism and a roof prism; the eyepiece group comprises a first eyepiece lens, a second eyepiece lens, a third eyepiece lens, a fourth eyepiece lens and a fifth eyepiece lens; target focusing at different distances is achieved by adjusting the focusing lens, when the anti-shake function is started, the anti-shake lens still stabilizes a target which is originally located in the center of a view field at the center of the view field according to sensing of the gyroscope, and by reasonably distributing focal power and aberration of all the lenses, the anti-shake function is achieved. The anti-shake lens compensates picture shake caused by telescope shake through translation, so that an observer can quickly and stably observe, and the observation quality is improved.

Description

Technical Field

[0001] This utility model relates to the field of image stabilization telescope manufacturing technology, specifically to an optical system for an optical image stabilization telescope. Background Technology

[0002] A telescope is a visual optical instrument used to observe distant targets; it gives the observer the feeling that the target is "closer," and reproduces targets or details that are originally beyond the human eye's resolution through the eyepiece for observation. The specific principle is: the angle between the distant target and the human eye is magnified according to the telescope's magnification for observation.

[0003] Because high-magnification telescopes have a small field of view, it is difficult to stabilize the field of view when handheld due to arm tremors. As a result, it is not easy for the observer to see the specific details of the target in a short time, and the observation experience is very poor for dynamic scenes that are moving. Stabilizers or tripods are required for stable observation, and they are generally large and heavy, making them inconvenient to carry. Therefore, it is very necessary to provide an optical system for an optically stabilized telescope that can quickly stabilize observation and improve the quality of observation. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide an optical system for an optically stabilized telescope. By rationally allocating the optical power and aberrations of each lens, the stabilizing lens compensates for image shake caused by telescope jitter through translation, thereby enabling the observer to quickly and stably observe and improving the quality of observation.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] An optical system for an optically stabilized telescope, wherein the optical system comprises an objective lens group, a prism group, and an eyepiece group arranged sequentially from the object side to the image side along the optical axis.

[0007] The objective lens group includes a first objective lens, a second objective lens, a third objective lens, a focusing lens, and an image stabilization lens;

[0008] The prism assembly includes a semi-pentagonal prism and a roof prism;

[0009] The eyepiece group includes a first eyepiece lens, a second eyepiece lens, a third eyepiece lens, a fourth eyepiece lens, and a fifth eyepiece lens;

[0010] The first objective lens is a biconvex lens whose focal length satisfies the following condition:

[0011] 0.4 < |f1 / f| < 1.1

[0012] Where f1 is the effective focal length of the first objective lens, and f is the focal length of the objective lens group;

[0013] The second objective lens is a meniscus negative lens with its convex surface facing the object side, and its focal length satisfies the following condition:

[0014] 0.4 < |f² / f| < 0.9

[0015] Where f2 is the effective focal length of the second lens of the objective lens, and f is the focal length of the objective lens group;

[0016] The first objective lens and the second objective lens together form a cemented lens, which satisfies the following conditions:

[0017] 1 <f12 / f<1.2

[0018] Where f12 is the effective focal length of the cemented lens composed of the first objective lens and the second objective lens, and f is the focal length of the objective lens group.

[0019] The Abbe numbers of the first objective lens and the second objective lens satisfy the following condition:

[0020] v1>V2>60

[0021] Where v1 is the Abbe number of the first lens of the objective lens, and v2 is the Abbe number of the second lens of the objective lens;

[0022] The objective lens, specifically the third lens, is a meniscus positive lens with its convex surface facing the object side, and it satisfies the following conditions:

[0023] 0.5 <f3 / f<0.8

[0024] 64 <v3<81

[0025] Where f3 is the effective focal length of the third objective lens, f is the focal length of the objective lens group, and v3 is the Abbe number of the third objective lens;

[0026] The focusing lens is a meniscus lens with its convex surface facing the object side, and it satisfies the following conditions:

[0027] 1.1 < |f4 / f| < 1.5

[0028] 30 <v4<40

[0029] Where f4 is the effective focal length of the focusing lens, f is the focal length of the objective lens group, and v4 is the Abbe number of the focusing lens.

[0030] Preferably, the image stabilization lens is a negative lens, which satisfies the following conditions:

[0031] 0.1 < |f5| / f < 0.3

[0032] |R5|>10|R6|

[0033] Where f5 is the effective focal length of the image stabilization lens, f is the focal length of the objective lens group, R5 is the object-side radius of curvature of the image stabilization lens, and R6 is the image-side radius of curvature of the image stabilization lens.

[0034] Preferably, the semi-pentagonal prism and the roof prism form a prism group that satisfies the following conditions:

[0035] The equivalent thickness of the unfolded glass plate is 0.5. <t6 / t7<0.7;

[0036] Where t6 is the equivalent glass plate thickness of the semi-pentagonal prism, and t7 is the equivalent glass plate thickness of the roof prism.

[0037] Preferably, the first lens of the eyepiece is a biconcave lens, which satisfies the following conditions:

[0038] 0.9 < |f8 / fe| < 1.3

[0039] v8<35

[0040] Where f8 is the effective focal length of the first lens of the eyepiece, fe is the focal length of the eyepiece group, and v8 is the Abbe number of the first lens of the eyepiece.

[0041] Preferably, the second lens of the eyepiece is a biconvex lens, which satisfies the following conditions:

[0042] 1.1 <f9 / fe<1.4

[0043] V9>60

[0044] Where f9 is the effective focal length of the second lens of the eyepiece, fe is the focal length of the eyepiece group, and v9 is the Abbe number of the second lens of the eyepiece.

[0045] Preferably, the first eyepiece lens and the second eyepiece lens form a cemented lens, which satisfies the following conditions:

[0046] 0.25 <v8 / v9<0.5

[0047] 7.2 <f89 / fe<7.7

[0048] Where v8 is the Abbe number of the first eyepiece lens, v9 is the Abbe number of the second eyepiece lens, f89 is the focal length of the cemented lens formed by the first and second eyepiece lenses, and fe is the focal length of the eyepiece group.

[0049] Preferably, the third lens of the eyepiece is a biconvex lens, which satisfies the following conditions:

[0050] 1.2 <f11 / f<1.9

[0051] V11>60

[0052] Where f11 is the effective focal length of the third lens of the eyepiece, fe is the focal length of the eyepiece group, and v9 is the Abbe number of the third lens of the eyepiece.

[0053] Preferably, the fourth lens of the eyepiece is a meniscus negative lens with its concave surface facing the object side, and it satisfies the following conditions:

[0054] 1.7 < |f11 / fe| < 2.3

[0055] V11<38

[0056] Where f11 is the effective focal length of the fourth lens of the eyepiece, fe is the focal length of the eyepiece group, and v11 is the Abbe number of the fourth lens of the eyepiece.

[0057] Preferably, the third eyepiece lens and the fourth eyepiece lens form a cemented lens, which satisfies the following conditions:

[0058] 0.85 <n10 / n11<0.92

[0059] 5.2 <f1011 / fe<5.6

[0060] Wherein n10 is the refractive index of the third eyepiece lens, n11 is the refractive index of the fourth eyepiece lens, f1011 is the focal length of the cemented lens formed by the third and fourth eyepiece lenses, and fe is the focal length of the eyepiece group.

[0061] Preferably, the fifth lens of the eyepiece is a meniscus lens with its convex surface facing the object side, and it satisfies the following conditions:

[0062] 0.92 <f12 / fe<1.12

[0063] n12>1.6

[0064] Wherein f12 is the effective focal length of the fifth lens of the eyepiece, fe is the focal length of the eyepiece group, and n12 is the refractive index of the fifth lens of the eyepiece.

[0065] Compared with the prior art, the beneficial effects of this utility model are:

[0066] In use, this invention sequentially installs the first objective lens, second objective lens, third objective lens, focusing lens, image stabilization lens, semi-pentagonal prism, roof prism, first eyepiece lens, second eyepiece lens, third eyepiece lens, fourth eyepiece lens, and fifth eyepiece lens in designated positions. Focusing on targets at different distances is achieved by adjusting the focusing lens. When image stabilization is activated, the image stabilization lens performs a function mapping based on the jitter information sensed by the gyroscope and feeds the displacement back to the image stabilization mechanism for corresponding dynamic translation. This keeps the target, originally in the center of the field of view, stable in the center. By rationally allocating the optical power and aberrations of each lens, the image stabilization lens compensates for image shake caused by telescope jitter through translation, enabling the observer to quickly achieve stable observation and improving observation quality. Attached Figure Description

[0067] Figure 1 This is a schematic diagram of the lens structure of the optical system of an optically stabilized telescope.

[0068] Figure 2 The MTF diagram of the optical system of the optically stabilized telescope;

[0069] Figure 3 Field curvature and distortion diagrams of the optical system of an optically stabilized telescope;

[0070] Figure 4 This is a diagram showing the transverse chromatic aberration of the optical system of an optically stabilized telescope.

[0071] In the diagram: 1. Objective lens 1; 2. Objective lens 2; 3. Objective lens 3; 4. Focusing lens; 5. Image stabilization lens; 6. Semi-pentaprism; 7. Roof prism; 8. Eyepiece lens 1; 9. Eyepiece lens 2; 10. Eyepiece lens 3; 11. Eyepiece lens 4; 12. Eyepiece lens 5. Detailed Implementation

[0072] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0073] Example:

[0074] Please see Figure 1 This embodiment provides an optical system for an optically stabilized telescope. The optical system of the optically stabilized telescope has a visual magnification of 12X, an exit pupil distance of 12.3mm, a full field of view of 4.6°, an exit pupil diameter of 2.1mm, and a minimum observation distance of 2m.

[0075] The optical system of this optically stabilized telescope consists of an objective lens group, a prism group, and an eyepiece group arranged sequentially from the object side to the image side along the optical axis.

[0076] The objective lens group includes objective lens 1, objective lens 2, objective lens 3, focusing lens 4, and image stabilization lens 5;

[0077] The prism assembly includes a semi-pentagonal prism 6 and a roof prism 7;

[0078] The eyepiece assembly includes eyepiece first lens 8, eyepiece second lens 9, eyepiece third lens 10, eyepiece fourth lens 11, and eyepiece fifth lens 12;

[0079] The optical system of this optically stabilized telescope has a length of 89.3 mm. The distance between the second objective lens 2 and the third objective lens 3 along the optical axis is 0.5 mm. The distance between the third objective lens 3 and the focusing lens 4 is variable, ranging from 19.398 mm to 16.597 mm. The distance between the focusing lens 4 and the image-stabilizing lens 5 is variable, ranging from 3.972 mm to 6.773 mm. The distance between the image-stabilizing lens 5 and the semi-pentaprism 6 is 11.15 mm. The distance between the semi-pentaprism 6 and the roof prism 7 is 0.35 mm. The distance between the roof prism 7 and the first eyepiece lens 8 is 9.952 m. The distance between the second eyepiece lens 9 and the third eyepiece lens 10 is 0.096 m. The distance between the fourth eyepiece lens 11 and the fifth eyepiece lens 12 is 0.05 m.

[0080] In this embodiment, the first objective lens 1 is a biconvex lens whose focal length satisfies the following condition:

[0081] 0.4 < |f1 / f| < 1.1

[0082] Where f1 is the effective focal length of the first objective lens 1, and f is the focal length of the objective lens group.

[0083] In this embodiment, the objective lens 2 is a meniscus negative lens with its convex surface facing the object side, and its focal length satisfies the following condition:

[0084] 0.4 < |f² / f| < 0.9

[0085] Where f2 is the effective focal length of the second objective lens 2, and f is the focal length of the objective lens group.

[0086] In this embodiment, the first objective lens 1 and the second objective lens 2 form a cemented lens, which satisfies the following conditions:

[0087] 1 <f12 / f<1.2

[0088] Where f12 is the effective focal length of the cemented lens composed of objective lens 1 and objective lens 2, and f is the focal length of the objective lens group.

[0089] In this embodiment, the Abbe numbers of the first objective lens 1 and the second objective lens 2 satisfy the following condition:

[0090] v1>V2>60

[0091] Where v1 is the Abbe number of the first objective lens 1, and v2 is the Abbe number of the second objective lens 2.

[0092] In this embodiment, the third objective lens 3 is a meniscus positive lens with its convex surface facing the object side, and it satisfies the following conditions:

[0093] 0.5 <f3 / f<0.8

[0094] 64 <v3<81

[0095] Where f3 is the effective focal length of the third objective lens 3, f is the focal length of the objective lens group, and v3 is the Abbe number of the third objective lens 3.

[0096] In this embodiment, the focusing lens 4 is a meniscus lens with its convex surface facing the object side, and it satisfies the following conditions:

[0097] 1.1 < |f4 / f| < 1.5

[0098] 30 <v4<40

[0099] Where f4 is the effective focal length of focusing lens 4, f is the focal length of the objective lens group, and v4 is the Abbe number of focusing lens 4.

[0100] In this embodiment, the image stabilization lens 5 is a negative lens, which satisfies the following conditions:

[0101] 0.1 < |f5| / f < 0.3

[0102] |R5|>10|R6|

[0103] Where f5 is the effective focal length of the image-stabilized lens 5, f is the focal length of the objective lens group, R5 is the object-side radius of curvature of the image-stabilized lens 5, and R6 is the image-side radius of curvature of the image-stabilized lens 5.

[0104] In this embodiment, the semi-pentaprism 6 and the roof prism 7 constitute a prism group, which satisfies the following conditions:

[0105] The equivalent thickness of the unfolded glass plate is 0.5. <t6 / t7<0.7;

[0106] Where t6 is the equivalent glass plate thickness of the semi-pentagonal prism 6, and t7 is the equivalent glass plate thickness of the roof prism 7. The material grade of both the semi-pentagonal prism 6 and the roof prism 7 is H-K9L.

[0107] In this embodiment, the first eyepiece lens 8 is a biconcave lens, which satisfies the following conditions:

[0108] 0.9 < |f8 / fe| < 1.3

[0109] v8<35

[0110] Where f8 is the effective focal length of the first eyepiece lens 8, fe is the focal length of the eyepiece group, and v8 is the Abbe number of the first eyepiece lens 8.

[0111] In this embodiment, the second eyepiece lens 9 is a biconvex lens, which satisfies the following conditions:

[0112] 1.1 <f9 / fe<1.4

[0113] V9>60

[0114] Where f9 is the effective focal length of the second eyepiece lens 9, fe is the focal length of the eyepiece group, and v9 is the Abbe number of the second eyepiece lens 9.

[0115] In this embodiment, the first eyepiece lens 8 and the second eyepiece lens 9 form a cemented lens, which satisfies the following conditions:

[0116] 0.25 <v8 / v9<0.5

[0117] 7.2 <f89 / fe<7.7

[0118] Where v8 is the Abbe number of the first eyepiece lens 8, v9 is the Abbe number of the second eyepiece lens 9, f89 is the focal length of the cemented lens formed by the first eyepiece lens 8 and the second eyepiece lens 9, and fe is the focal length of the eyepiece group.

[0119] In this embodiment, the third lens 10 of the eyepiece is a biconvex lens, which satisfies the following conditions:

[0120] 1.2 <f11 / f<1.9

[0121] V11>60

[0122] Where f11 is the effective focal length of the third lens 10 of the eyepiece, fe is the focal length of the eyepiece group, and v9 is the Abbe number of the third lens 10 of the eyepiece.

[0123] In this embodiment, the fourth lens 11 of the eyepiece is a meniscus negative lens with its concave surface facing the object side, and it satisfies the following conditions:

[0124] 1.7 < |f11 / fe| < 2.3

[0125] V11<38

[0126] Where f11 is the effective focal length of the fourth lens 11 of the eyepiece, fe is the focal length of the eyepiece group, and v11 is the Abbe number of the fourth lens 11 of the eyepiece.

[0127] In this embodiment, the third eyepiece lens 10 and the fourth eyepiece lens 11 form a cemented lens, which satisfies the following conditions:

[0128] 0.85 <n10 / n11<0.92

[0129] 5.2 <f1011 / fe<5.6

[0130] Where n10 is the refractive index of the third eyepiece lens 10, n11 is the refractive index of the fourth eyepiece lens 11, f1011 is the focal length of the cemented lens formed by the third eyepiece lens 10 and the fourth eyepiece lens 11, and fe is the focal length of the eyepiece group.

[0131] In this embodiment, the fifth lens 12 of the eyepiece is a meniscus lens with its convex surface facing the object side, and it satisfies the following conditions:

[0132] 0.92 <f12 / fe<1.12

[0133] n12>1.6

[0134] Where f12 is the effective focal length of the fifth lens 12 of the eyepiece, fe is the focal length of the eyepiece group, and n12 is the refractive index of the fifth lens 12 of the eyepiece.

[0135] In one alternative embodiment, the first objective lens 1, the second objective lens 2, the third objective lens 3, the focusing lens 4, the image stabilizing lens 5, the semi-pentagonal prism 6, the roof prism 7, the first eyepiece lens 8, the second eyepiece lens 9, the third eyepiece lens 10, the fourth eyepiece lens 11, and the fifth eyepiece lens 12 are all made of optical glass, and all optical surfaces are spherical.

[0136] As a preferred embodiment of the technical solution, the parameters of the optical system of the optically stabilized telescope are shown in Tables 1, 2, 3, and 4. A structural schematic diagram is provided for reference. Figure 1 Table 1 shows the surface numbering when the surface closest to the object is designated as surface 1, and the numbers are incremented sequentially as the surface moves toward the imaging plane. The shape parameters of each lens are also listed.

[0137] Table 1

[0138]

[0139]

[0140] As a preferred embodiment of this technical solution, the positions of the optical system of the optically stabilized telescope under different focusing states are shown in Table 2 below, which are the values ​​of states D1 and D2 in Table 1:

[0141] Table 2

[0142] Conjugate distance Infinity 2m D1 19.398 16.597 D2 3.972 6.773

[0143] As a preferred technical solution, the physical parameters of the objective lens and eyepiece in the optical system of the optically stabilized telescope in this embodiment are shown in Table 3 below:

[0144] Table 3

[0145] Lens group focal length 2w field of view objective lens 131.371 4.6° eyepiece 11.12 51.46°

[0146] As a preferred technical solution, the relationship between the transient jitter angle of the optical system and the displacement compensation amount of the focusing lens in this embodiment of the optically stabilized telescope is shown in Table 4:

[0147] Table 4

[0148]

[0149]

[0150] The working principle and usage process of this utility model are as follows: When using it, the operator sequentially installs the objective lens 1, objective lens 2, objective lens 3, focusing lens 4, image stabilizing lens 5, semi-pentagonal prism 6, roof prism 7, eyepiece 1 lens 8, eyepiece 2 lens 9, eyepiece 3 lens 10, eyepiece 4 lens 11, and eyepiece 5 lens 12 in the designated positions, and achieves focusing on targets at different distances by adjusting the focusing lens 4.

[0151] When the image stabilization function is turned on, the image stabilization lens 5 performs function mapping based on the jitter information sensed by the gyroscope and feeds back the displacement to the image stabilization mechanism for corresponding dynamic translation, so that the target that was originally in the center of the field of view is still stabilized in the center of the field of view.

[0152] Figure 2 , Figure 3 , Figure 4 This describes the optical performance of this invention without image stabilization (image captured by an ideal 17mm focal length lens). Figure 2 It's an MTF chart. Figure 3 It is a field curvature and distortion diagram. Figure 4 It is a transverse chromatic aberration diagram. It can be seen that the MTF is better than 0.7 and the distortion is <2.5% at 50 lp / mm in the central field of view. The transverse chromatic aberration convergence of each wavelength in the entire field of view is ideal, and it has excellent performance.

[0153] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. An optical system for an optically stabilized telescope, characterized in that, The telescope's optical system consists of an objective lens group, a prism group, and an eyepiece group arranged sequentially from the object side to the image side along the optical axis. The objective lens group includes a first objective lens (1), a second objective lens (2), a third objective lens (3), a focusing lens (4), and an image stabilizing lens (5); The prism assembly includes a semi-pentagonal prism (6) and a roof prism (7); The eyepiece group includes an eyepiece first lens (8), an eyepiece second lens (9), an eyepiece third lens (10), an eyepiece fourth lens (11), and an eyepiece fifth lens (12); The objective lens (1) is a biconvex lens whose focal length satisfies the following condition: 0.4 < |f1 / f| < 1.1 Where f1 is the effective focal length of the first objective lens (1), and f is the focal length of the objective lens group; The objective lens (2) is a meniscus negative lens with its convex surface facing the object side, and its focal length satisfies the following condition: 0.4 < |f² / f| < 0.9 Where f2 is the effective focal length of the second lens (2) of the objective lens, and f is the focal length of the objective lens group; The first objective lens (1) and the second objective lens (2) form a cemented lens, which satisfies the following conditions: 1 <f12 / f<1.2 Where f12 is the effective focal length of the cemented lens composed of the first objective lens (1) and the second objective lens (2), and f is the focal length of the objective lens group; The Abbe numbers of the first objective lens (1) and the second objective lens (2) satisfy the following condition: v1>V2>60 Where v1 is the Abbe number of the first lens (1) of the objective lens, and v2 is the Abbe number of the second lens (2) of the objective lens; The objective lens (3) is a meniscus lens with its convex surface facing the object side, and it satisfies the following conditions: 0.5 <f3 / f<0.8 64<v3<81 Where f3 is the effective focal length of the third objective lens (3), f is the focal length of the objective lens group, and v3 is the Abbe number of the third objective lens (3); The focusing lens (4) is a meniscus lens with its convex surface facing the object side, and it satisfies the following conditions: 1.1 < |f4 / f| < 1.5 30<v4<40 Where f4 is the effective focal length of the focusing lens (4), f is the focal length of the objective lens group, and v4 is the Abbe number of the focusing lens (4).

2. The optical system of an optically stabilized telescope according to claim 1, characterized in that, The image stabilization lens (5) is a negative lens, which satisfies the following conditions: 0.1 < |f5| / f < 0.3 |R5|>10|R6| Where f5 is the effective focal length of the image stabilization lens (5), f is the focal length of the objective lens group, R5 is the object-side radius of curvature of the image stabilization lens (5), and R6 is the image-side radius of curvature of the image stabilization lens (5).

3. The optical system of an optically stabilized telescope according to claim 1, characterized in that, The semi-pentagonal prism (6) and the roof prism (7) constitute a prism group, which satisfies the following conditions: The equivalent thickness of the unfolded glass plate is 0.

5. <t6 / t7<0.7; Where t6 is the equivalent glass plate thickness of the semi-pentagonal prism (6) and t7 is the equivalent glass plate thickness of the ridge prism (7).

4. The optical system of an optically stabilized telescope according to claim 1, characterized in that, The first lens (8) of the eyepiece is a biconcave lens, which satisfies the following conditions: 0.9 < |f8 / fe| < 1.3 v8<35 Where f8 is the effective focal length of the first eyepiece lens (8), fe is the focal length of the eyepiece group, and v8 is the Abbe number of the first eyepiece lens (8).

5. The optical system of an optically stabilized telescope according to claim 4, characterized in that, The second lens (9) of the eyepiece is a biconvex lens, which satisfies the following conditions: 1.1 <f9 / fe<1.4 V9>60 Where f9 is the effective focal length of the second eyepiece lens (9), fe is the focal length of the eyepiece group, and v9 is the Abbe number of the second eyepiece lens (9).

6. The optical system of an optically stabilized telescope according to claim 5, characterized in that, The first eyepiece lens (8) and the second eyepiece lens (9) form a cemented lens, which satisfies the following conditions: 0.25 <v8 / v9<0.5 7.2 <f89 / fe<7.7 Where v8 is the Abbe number of the first eyepiece lens (8), v9 is the Abbe number of the second eyepiece lens (9), f89 is the focal length of the cemented lens formed by the first eyepiece lens (8) and the second eyepiece lens (9), and fe is the focal length of the eyepiece group.

7. The optical system of an optically stabilized telescope according to claim 1, characterized in that, The third lens (10) of the eyepiece is a biconvex lens, which satisfies the following conditions: 1.2 <f11 / f<1.9 V11>60 Where f11 is the effective focal length of the third lens (10) of the eyepiece, fe is the focal length of the eyepiece group, and v9 is the Abbe number of the third lens (10) of the eyepiece.

8. The optical system of an optically stabilized telescope according to claim 7, characterized in that, The fourth lens (11) of the eyepiece is a meniscus negative lens with its concave surface facing the object side, and it satisfies the following conditions: 1.7 < |f11 / fe| < 2.3 V11<38 Where f11 is the effective focal length of the fourth lens (11) of the eyepiece, fe is the focal length of the eyepiece group, and v11 is the Abbe number of the fourth lens (11) of the eyepiece.

9. The optical system of an optically stabilized telescope according to claim 8, characterized in that, The third eyepiece lens (10) and the fourth eyepiece lens (11) form a cemented lens, which satisfies the following conditions: 0.85 <n10 / n11<0.92 5.2 <f1011 / fe<5.6 Wherein n10 is the refractive index of the third eyepiece lens (10), n11 is the refractive index of the fourth eyepiece lens (11), f1011 is the focal length of the cemented lens formed by the third eyepiece lens (10) and the fourth eyepiece lens (11), and fe is the focal length of the eyepiece group.

10. The optical system of an optically stabilized telescope according to claim 1, characterized in that, The fifth lens (12) of the eyepiece is a meniscus lens with its convex surface facing the object side, and it satisfies the following conditions: 0.92 <f12 / fe<1.12 n12>1.6 Wherein f12 is the effective focal length of the fifth lens (12) of the eyepiece, fe is the focal length of the eyepiece group, and n12 is the refractive index of the fifth lens (12) of the eyepiece.

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