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Tele Vue Nagler Type 6 13mm 82° Eyepiece - 1.25"
The Tele Vue Nagler Type 6 13mm is often the most utilized optic in an observer's kit, providing a mid-range magnification that balances deep-sky reach with a manageable exit pupil. It serves as a practical entry point into ultra-wide-field observing for those who find 100° fields difficult to navigate or overly taxing on eye placement. In an 8-inch f/10 SCT, this eyepiece yields 154x magnification, a versatile power for resolving globular clusters like M13 while maintaining a dark sky background.
17.6mm Field Stop and Framing Reality
This eyepiece is sized for "set and forget" observing, where the 17.6mm field stop allows you to keep an object centered longer in non-tracking telescopes compared to a standard Plössl. In an f/6 Newtonian, the resulting 2.2mm exit pupil is large enough to keep the Orion Nebula (M42) bright while the 82° field provides the physical space to see the outer dust lanes. The compact 1.25-inch form factor ensures the telescope remains balanced, avoiding the frequent re-balancing required by heavier 2-inch wide-field optics.
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82° AFOV: Delivers an immersive experience that fills the primary visual field without requiring the "head-swivel" movement often necessary for 100° designs.
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7-Element Optical Train: Maintains sharp star points across the field in fast f/4.5 systems, reducing the need to swap eyepieces when moving from the center to the edge of the frame.
Operational Comparison and Trade-offs
The Tele Vue Nagler Type 6 13mm is a specialized tool for observers who prioritize a lightweight, high-transmission path over long eye relief or extreme field width. It represents a specific mechanical choice for binoviewer users who require narrow housings to accommodate interpupillary distances.
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vs. Tele Vue Delos 14mm: The Delos offers 20mm of eye relief for comfortable use with glasses, but the 13mm Nagler provides a wider field in a package half the weight.
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vs. 13mm Plössl: While a Plössl has fewer glass elements, its 50° field physically cannot frame the full extent of the North American Nebula (NGC 7000) at this focal length.
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Is the Tele Vue Nagler Type 6 13mm suitable for eyeglass wearers?
With 12mm of eye relief, the Tele Vue Nagler Type 6 13mm is typically used without glasses to see the full 82° field. Observers with significant astigmatism may prefer the Tele Vue Delos or DeLite series which offer 20mm of eye relief.
Why choose the 13mm Nagler for a binoviewer?
The Tele Vue Nagler Type 6 13mm features a slim 1.9-inch maximum diameter, making it one of the few ultra-wide eyepieces that comfortably fits binoviewers for observers with narrow interpupillary distances. Its light weight also prevents excess strain on the binoviewer's internal prisms.
Does the 13mm Nagler require a coma corrector?
While the Tele Vue Nagler Type 6 13mm is corrected for edge-of-field aberrations, Newtonians faster than f/5 will still show coma inherent to the telescope mirror. Using a Tele Vue Paracorr is recommended to achieve diffraction-limited performance across the entire 82° field.
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| Focal Length |
13 mm |
| Apparent Field of View |
82° |
| Eye Relief |
12 mm |
| Field Stop Diameter |
17.6 mm |
| Barrel Size |
1.25" |
| Weight |
0.40 lbs (6.4 oz) |
| Lens Elements |
7 |
| Parfocal Group |
Group B |
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Nagler 13mm Type 6 Eyepiece
× 1
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TeleVue 5-Year Limited Warranty for Telescopes and Accessories
