TeleVue Nagler 31mm Type 5 Eyepiece 2“ — 82° AFOV
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Vai al moduloThe TeleVue Nagler 31mm Type 5 is the legendary "king of the field": affectionately nicknamed "Uncle Al's hand grenade" by observers for its stocky shape, it offers the widest true field achievable in a 2" barrel with an 82° apparent field of view, without giving up the razor-sharp performance that defines the Nagler series.
The widest true field ever achieved in a 2" barrel
Building a 31mm Nagler by simply scaling up the classic formula would have produced an enormous, extremely heavy eyepiece. TeleVue solved the problem with an innovative 6-element design, some elements over 70mm in diameter, using four types of special glass. The result is a 42mm field stop, the widest possible in a 2" barrel without resorting to a 3" focuser, with a true field area 82% larger than the 22mm Nagler Type 4.
Ideal for Dobsonians and fast Newtonians
Thanks to its wide field, owners of Dobsonians or fast Newtonians can observe without the secondary-mirror shadowing that affects other wide-field eyepieces at this focal length, and with longer intervals between manual nudges. The 19mm eye relief ensures comfortable viewing even with glasses. Note the significant weight (nearly 1kg): on large Dobsonians, switching from a lighter eyepiece to this one may require rebalancing.
Construction and compatibility
The 2" (50.8mm) barrel features filter threads for standard astronomy filters, a rubber grip and a safety undercut groove. Lens edges are blackened for maximum contrast. Like every TeleVue eyepiece, it undergoes a 100% full-field visual inspection before shipping.
Technical specifications
| Product code | EN5-31.0 |
|---|---|
| Series | Nagler Type 5 |
| Focal length | 31 mm |
| Apparent field of view (AFOV) | 82° |
| Eye relief | 19 mm |
| Optical elements | 6 |
| Field stop | 42 mm |
| Optical coating | Proprietary TeleVue multi-layer, blackened lens edges |
| Barrel | 2" (50.8mm) with filter threads |
| Eyecup | Rubber, fold-down |
| Weight | 998 g |
| Length | 133 mm |
| Made in | USA — TeleVue Optics |