Binocular

A binocular comprising two telescope systems having parallel optical axes,

• wherein each of said telescope systems comprises an object optical system and an eyepiece optical system, and an object optical axis of a frontmost lens of said object optical system and an eyepiece optical axis of said eyepiece optical system being parallel but not coaxial, at least said eyepiece optical systems being rotatable about the object optical axes for interpupillary adjustment;
• wherein each telescope system further comprises a magnifying-power-varying lens group;
• wherein a magnifying-power-varying mechanism is provided for moving said magnifying-power-varying lens groups, said mechanism comprising drive members, a connecting member and at least one regulating member;
• wherein said drive members comprises drive rings rotatably provided for axially moving said magnifying-power-varying lens groups,
• said connecting member is belt-shaped and synchronously rotates said drive rings, and
• said at least one regulating member regulates the position of said connecting member within a predetermined range in a direction parallel to said eyepiece optical axes;
• and
• wherein a first unit comprises at least said frontmost lens of said object optical system,
• a second unit comprises said eyepiece optical systems,
• rear barrels for supporting remaining lens groups of said object optical systems other than said frontmost lenses and lens groups of objective side of eyepiece optical systems,
• a support frame for supporting said rear barrels with a predetermined margin for adjustment in the direction of said eyepiece optical axes, and
• said magnifying-power-varying mechanism.

A binocular comprising:

• two telescope systems having parallel optical axes;
• a focus adjusting mechanism for focusing said telescope systems;
• a diopter correction mechanism for adjusting a diopter of said telescope system relative to each other;
• a magnifying-power-varying mechanism for adjusting the magnifying-power of said telescope systems;
• and
• operation controllers for operating each of said focus adjusting mechanism, said diopter correction mechanism, and said magnifying-power-varying mechanism,
• wherein said operation controllers are centered between said two telescope systems;
• each of said telescope systems comprising an object optical system and an eyepiece optical system, an object optical axis of a frontmost lens of said object optical system and an eyepiece optical axis of said eyepiece optical system being parallel to each other but not being coaxial, at least said eyepiece optical systems being rotatable about said object optical axes for interpupillary adjustment, said focus adjustment mechanism moving said frontmost lenses of said object optical systems in each telescope system, and said diopter correction mechanism moving only one of said frontmost lenses relative to corresponding frontmost lenses of the other telescope system,
• said focus adjusting mechanism comprising a first arm and a second arm engaging frames which hold said frontmost lenses of said object optical systems of said telescope systems, said diopter correction mechanism comprising said second arm,
• wherein said first arm and said second arm are guided by a guiding mechanism so that said first arm and said second arm move parallel to said optical axes, and
• a cover that covers a region where said first arm and said second arm are positioned, said cover having a vertical regulating mechanism that vertically regulates said first arm and said second arm.