Tele Vue Nagler 31mm Type 5
The widest, most immersive low-power view a 2-inch focuser can give, the eyepiece observers simply call the “Terminagler.”
This is a low-power, widest-true-field eyepiece, the one you reach for to find a target, frame a whole nebula, or sweep the Milky Way. It is not, and was never meant to be, a high-magnification planetary eyepiece.
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What it's best at — and the trade-offs.
One eyepiece. A different job in every scope.
An eyepiece has no magnification of its own — the telescope decides. The same eyepiece becomes 15× and 5.3° of sky in a little refractor, or 66× and a tight frame in a long SCT. Here’s what it does across common scopes.
The numbers, in plain English.
The targets this eyepiece was born for.
Where it sits in your eyepiece case.
A good eyepiece collection isn’t a pile of glass — it’s two or three focal lengths that hand off from wide to tight. This is the anchor at the bottom of the ladder: the one you find and frame with. You buy it once, and it stays your low-power eyepiece for life.
What it pairs with.
A big fast Dob, a coma corrector, this eyepiece and an OIII filter, the setup that shows you the whole Veil Nebula in one breathtaking view.
Open this rig in the Simulator →How it scores, and why.
Judged not by its price but by whether it delivers on its purpose, the widest, most immersive true field a 2-inch focuser can produce. On that measure it is close to perfect, which is why it has stayed in production, essentially unchanged, for two decades.
Polaris weighs how well the eyepiece does the job it was designed for — optics, immersion, comfort and value — never list price or brand.
An honest fit check.
Full specifications.
At 82°, the edge disappears into your peripheral vision, and that, more than any number on the spec sheet, is the whole reason this eyepiece exists. Buy it once, and it stays your low-power eyepiece for life.
For a different goal, start here.
Tele Vue Panoptic 41 mm
A touch narrower apparent field (68°) but the widest TRUE field of any 2″ eyepiece, lighter and cheaper, too.
Tele Vue Ethos 21 mm
100° of apparent field and more magnification, grander still, if you can carry (and afford) the extra glass.
Tele Vue Nagler 26 mm T5
Nearly the same 82° experience with more reach, in a noticeably smaller and lighter body.