Tele Vue 3-6mm Click-Stop Zoom Nagler Eyepiece - 1.25

The Tele Vue 3–6mm Nagler Zoom Eyepiece is a rare and precision-engineered tool, offering continuous zoom with click-stops at 3, 4, 5, and 6mm—all in a compact 1.25" design. It stands out as one of the few zoom eyepieces to maintain parfocality, sharpness, and a consistent 50° field across its range, making it a unique choice for high-power planetary observing.

• • Full Specifications
    • Focal Length: 3mm to 6mm (continuously variable)
    • Apparent Field of View: 50° (constant across zoom range)
    • Eye Relief: 10 mm
    • Barrel Size: 1.25" (31.7 mm)
    • Field Stop Diameter: 2.6 mm to 5.1 mm
    • Optical Design: 5 elements in 3 groups
    • Coatings: Fully multi-coated optics
    • Parfocal: Yes – maintains focus across zoom range
    • Click Stops: At 3mm, 4mm, 5mm, and 6mm positions
    • Filter Threads: Accepts standard 1.25" filters (M28.5 x 0.6)
    • Lens Edge Treatment: Blackened edges to reduce stray light
    • Eye Guard: Fold-down rubber eyecup
    • Weight: Approximately 5.3 oz (150 g)
    • Dimensions: Approximately 1.7" (43 mm) diameter x 2.3" (58 mm) length
    • Compatibility: Parfocal with Tele Vue Group B eyepieces, including 8–32mm Plössls, all DeLite eyepieces, 19 & 24mm Panoptics, 3.5–12mm Delos, 16mm Nagler Type 5, and all 1.25" Nagler Type 6 eyepieces
    • Country of Manufacture: Japan
    • Warranty: Limited lifetime warranty
  • Key Features
    • High-Power Planetary Viewing: Ideal for dialing in optimal magnification for planetary and lunar observations, especially with short-focal-length telescopes.
    • Consistent Performance: Maintains constant apparent field of view and eye relief throughout the zoom range.
    • Parfocal Design: Allows for seamless zooming without the need to refocus, enhancing observing convenience.
    • Click-Stop Mechanism: Provides tactile feedback at standard focal lengths (3mm, 4mm, 5mm, 6mm) for easy and precise adjustments.
    • Compact and Lightweight: Designed for portability and ease of use, making it suitable for both visual observation and binoviewer applications