Nikon Binocular Microscope Head Adjustable Interpupillary 23mm Eyepiece Tubes

Nikon Binocular Microscope Head Adjustable Interpupillary 23mm Eyepiece Tubes

This is a Nikon binocular microscope head with an adjustable interpupillary eyepiece assembly, made in Japan. It mounts to a compatible Nikon compound microscope body and accepts standard 23mm eyepieces (not included), allowing the user to customize viewing position for comfort and optical alignment. The interpupillary distance is adjustable across an approximate range of 50° to 70° via the numbered dial on the front of the head.

Specifications & What's Included

• Brand: Nikon (Japan)
• Type: Binocular microscope head
• Eyepiece tube inner diameter: 23mm
• Eyepiece tube depth: approximately 30mm
• Interpupillary adjustment range: approximately 50°–70°
• Lower mounting ring outer diameter (OD): approximately 49mm
• Lower mounting ring inner diameter (ID): approximately 45mm
• Bottom optical element: visible through mounting ring; appears clean and intact
• Eyepieces: NOT included — head only

Applications

Nikon binocular microscope heads like this one are used as the primary viewing assembly on compound upright microscopes, directing the optical path from the objective/nosepiece up to the observer's eyes. The binocular configuration with adjustable interpupillary distance accommodates users with different eye spacing, reducing eye fatigue during extended observation sessions. These heads are standard equipment in biological research labs, pathology and histology settings, educational institutions, and quality control environments. A replacement or spare head of this type is commonly needed when the original is damaged, when converting a monocular microscope to binocular viewing, or when building up a system from separate components. The 23mm eyepiece tube diameter and approximately 49mm lower mounting ring are dimensional specs that buyers use to confirm compatibility with their specific Nikon microscope body before purchasing.