| 摘要 |
PROBLEM TO BE SOLVED: To provide an eyepiece that has a long eye relief, a wide viewing angle, a small size, and a high optical performance, and provide an observation device and imaging device including the eyepiece.SOLUTION: The finder optical system includes, sequentially from the image display surface side to the observation side, a first lens G1 having a positive refractive power, a second lens G2 having a negative refractive power, and a third lens G3 having a positive refractive power. In the finder optical system, the curvature radius of the surface of the first lens on the observation side, the curvature radius of the surface of the second lens on the image display surface side, the interval on the optical axis from the image display surface when the diopter scale is -1.0 diopter to the surface of the first lens on the image display surface side, and the focal distance of the whole finder optical system are set appropriately.SELECTED DRAWING: Figure 1 |
