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Tele Vue
Tele Vue 3-6mm Nagler Zoom 1.25" Eyepiece
Continuous 3–6 mm zoom with click-stops, constant 50° field and 10 mm eye relief in a 1.25" barrel
- Variable 3–6mm zoom with click-stops at each millimetre
- Constant 50-degree apparent field across the zoom range
- Five-element, three-group design reduces air-glass surfaces for higher contrast
- 10mm eye relief maintained at every focal length
- Parfocal with Group B eyepieces for fast swaps without refocusing
Zoom Range and Purpose
The Tele Vue 3-6mm Nagler Zoom 1.25" Eyepiece provides variable focal lengths from 3mm to 6mm with click-stops at every millimetre. It is designed for astronomers who need to adjust magnification quickly while observing planetary detail or splitting double stars under changing seeing conditions.
Build and Handling
A 5-element, 3-group optical design is fully multi-coated to maximise contrast and resolution across the zoom range. The barrel fits standard 1.25" focusers and features a slip-resistant textured surface, while consistent 10mm eye relief and parfocality with Group 'B' eyepieces simplify swapping without refocusing.
Practical Limits
The apparent field of view remains fixed at 50 degrees throughout the zoom range, which is narrower than many wide-angle oculars. Eye relief stays at 10mm even at the shortest focal length, so observers who wear glasses may find the view restrictive at high power.
Highlights
- Variable 3–6mm zoom with click-stops at each millimetre
- Constant 50-degree apparent field across the zoom range
- Five-element, three-group design reduces air-glass surfaces for higher contrast
- 10mm eye relief maintained at every focal length
- Parfocal with Group B eyepieces for fast swaps without refocusing
Specifications
No published specifications for this item yet.
Questions about this item
What does the 1.25" barrel diameter mean for telescope fit?
The 1.25" barrel fits standard 1.25" focusers and diagonals used on most amateur telescopes.
What physical clearance does the 10mm eye relief require?
The 10mm eye relief is the distance your eye must sit from the top lens to see the full 50-degree field; glasses wearers may find it tight.
How do I set the zoom to a precise focal length?
Turn the zoom ring until it clicks; each detent locks at 3mm, 4mm, 5mm or 6mm so the focal length stays exact.
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