20x120 IV/ 25x120


  • Large 120mm objective diameter realises a brighter, high-resolution image
  • The Binocular Telescope 20x120 IV with a superior optical system achieves a sharp image with various aberrations effectively compensated
  • The Binocular Telescope 25x120 enables high-power and dynamic observation with superior image flatness while realising a wide field of view (64.7° apparent field of view)
  • Long eye relief design ensures a clear field of view. Horn-shaped rubber eyecups are employed for easier viewing.
  • Airtight waterproof structure prevents rain and night dew entering. Fogproof construction filled with nitrogen gas keeps the binoculars fog-free inside. High corrosion-proofing and shake-resistance features maintain performance over an extended life.
  • Equipped with a solid fork mount, easy handling is achieved with 360° horizontal rotation and -30° (downward) to +70° (upward) tilting
  • Using a durable pillar stand w/adapter (optional) enables stabler, easier observation


20x120 IV 25x120
Magnification (x) 20 25
Objective diameter (mm) 120 120
Angular field of view (real) (°) 3.0 2.9
Angular field of view (apparent) (°) *1 55.3 64.7
Field of view at 1,000 m/yd. (m/ft) 52/156 50/150
Exit pupil (mm) 6.0 4.8
Relative brightness 36.0 23.0
Eye relief (mm) 20.8 18.9
Close focusing distance (m/ft) 133/436.4 210/689.0
Length (mm/in.) 680/26.8 672/26.5
Width (mm/in.) 454/17.9 454/17.9
Height (mm/in.) 160/6.3 160/6.3
Weight (kg/oz.) 14/493.8 14/493.8
Interpupillary distance adjustment (mm/in.) 58-74/2.3-2.9 58-74/2.3-2.9
Diopter adjustment (m-1) -5 - +3 -5 - +3
Structure Waterproof (up to 2m/6.6 ft for 10 minutes)*2 and nitrogen gas filled
  • *1Apparent field of view is calculated based on the ISO14132-1:2002 standard.
  • *2The binocular telescope is waterproof, and will suffer no damage to the optical system if submerged or dropped in water to a maximum depth of 2m/6.6 ft for up to 10 minutes.