Abstract: Binoculars having a center-focusing function and an individual-focusing comprise a telescopic base provided at an end thereof with a control sleeve which is connected to a left lens system in a left barrel and a right lens system in a right barrel through an adjusting portion disposed in the telescopic base. When a user pushes the control sleeve so that the control sleeve is forced to shift toward the adjusting portion, the user can rotate the control sleeve to simultaneously actuate the adjusting portion, so as to adjust focuses of the left and right lens systems. When the user pulls the control sleeve so that the control sleeve is forced to shift away from the adjusting portion, the user can rotate the control sleeve to simultaneously actuate the adjusting portion, so as to adjust a parallax between one and the other of the left and right lens systems.

Abstract: In a binocular telescope with an adjustable prism module, an eyepiece lens module, a prism module and an objective lens module are installed inside a telescope tube of the binocular telescope. The prism module includes a prism base, a first right-angle prism, a Porro prism, a second right-angle prism and a support base, and an exit surface of the first right-angle prism is connected with an incident surface of the Porro prism, and the second right-angle prism is set on the support base, and the incident surface of the second right-angle prism is attached to the Porro prism. The first and second right-angle prisms can be adjusted to change the angle of optical axes among the prism module, the eyepiece lens module and the objective lens module to prevent a distortion of the optical imaging.