Nikon CFUW 10x Widefield Microscope Eyepieces 30mm Pair CFU W Binocular

Nikon CFUW 10x Widefield Microscope Eyepieces 30mm Pair CFU W Binocular

This listing is for a matched pair of Nikon CFUW 10x widefield microscope eyepieces with a 30mm outer diameter insertion tube. The CFUW designation indicates Nikon's compensating flat-field ultra-widefield design, intended for use with Nikon CF (Chrome-Free) optics systems. The optical elements appear clean with no visible fogging, haze, or internal contamination. The plastic housing around the top rim of both eyepieces has sustained damage — chipping and cracking is present and clearly visible in the photos.

Specifications & What's Included

• Brand: Nikon (Made in Japan)
• Model: CFUW 10x (also written CFUW10x)
• Magnification: 10x
• Eyepiece type: Widefield (UW — ultra-widefield)
• Insertion tube outer diameter: 30mm
• Quantity: Pair (2 matched eyepieces)
• Optical condition: Appears clean — no visible fogging or haze
• Housing condition: Plastic rim/edge on both eyepieces is chipped and cracked — see photos
• Includes: Two eyepieces only — no case, caps, or accessories

Applications

Nikon CFUW eyepieces are designed for Nikon binocular and trinocular research microscopes that accept 30mm eyepieces, including models from the Nikon Optiphot, Labophot, and related CF-optics series. The CFUW (compensating flat-field ultra-widefield) design provides a wide apparent field of view with flat, sharp imagery edge to edge when used with compatible Nikon CF objectives. They are commonly used in biological, materials science, and laboratory research microscopy. Replacement or spare eyepieces like these are sought after by labs maintaining older Nikon CF-series microscopes, as well as by collectors and repair technicians. The 30mm tube diameter is specific to Nikon's own eyepiece standard and is not interchangeable with the more common 23.2mm or 30mm JIS-standard tubes used by other manufacturers — confirm your microscope's eyepiece tube size before purchasing.