Sport Optics

Structure and Optical Technologies

Focus adjustment

Focusing of CF binoculars

 
Movable internal lenses

Rotating the central focusing ring engages the internal shafts. Then, the tubes that fix internal lenses (concave lens) move so that the binoculars focus. Because objective lens and eyepiece lens are fixed, binoculars can have a highly airtight structure. This is recommended for CF (Central Focusing) waterproof binoculars.

Focusing of IF binoculars

 
Movable eyepiece lens unit

Rotating diopter adjustment rings that are located on both left and right eyepieces, moves the entire eyepiece lens unit in order to focus.

Sport Optics Guide -Binoculars-


Basic Information about Binoculars


How to Choose Binoculars


How to Use Binoculars


Structure and Optical Technologies


Sport Optics Guide -Fieldscopes-