Tele Vue 12mm Nagler Type 4 Eyepiece - 1.25"/2"

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Tele Vue 12mm Nagler Type 4 Eyepiece - 1.25"/2"
Item # TE-EN4-12.0
2 Questions(s)

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  • The Televue 12mm Nagler Type 4 eyepiece is a 6-element design with more true field than the Type 2 and better imaging and contrast enhancement.
  • This is a 2/1.25" barrel design with an 82 apparent field of view and 17mm of eye relief.
  • The Televue 12mm Nagler Type 4 has blackened lens edges, anti-reflection threads and rubber eyeguards deliver maximum contrast.
  • 100% full field visual inspection with TeleVue flat-field test instruments guarantees performance.


Tele Vue 12mm Nagler Type 4 Eyepiece - 1.25"/2"

Televue Nagler Type 4 Eyepieces: Applying the experience of the Radian development to the 82° Nagler series, yielded more contrast, reduced pincushion, more true field, longer eye-relief, and fewer elements to achieve focal lengths of 12mm, 17mm and 22mm. With added eye-relief, the click-stop Instadjust eyeguard helps maintain proper eye distance and centration. When TeleVue designed the Radian series of eyepieces, they used the Nagler concept as the basis. However with the Radians, the decided to balance size, weight, and cost relative to a consistent 20mm eye relief. During the design process they found they could not only balance these factors for 1.25" focusers, but new glass types lead to better imaging, contrast enhancement, reduced pincushion, ghost suppression, and a new concept in a click-stop adjustable eyeguard as well.

Applying that experience to the 82 degree, Nagler Type 2 design goals would potentially provide increased eye-relief, more contrast, reduced pincushion, and more true field as well. The first Nagler Type 4 to arrive is the 12mm version, replacing not only the 12mm Nagler Type 2 but its predecessor 13mm (the first Nagler) and the 11mm, now considered a collector item. Users confirm that for deep sky viewing, the comfort, clarity and contrast of the 12mm Type 4 gets Tele Vue closer to their "spacewalk" viewing goal. Similar in size and weight to Type 2, it has more true field and 50% greater eye relief, while using just six elements.

Additional Information

Additional Information

SKU TE-EN4-12.0
Manufacturer Tele Vue
Optical Design Nagler
Barrel Size 1.25"/2"
Warranty Lifetime Warranty
Eyepiece Field of View - Apparent 82º
Eyepiece Focal Length 12mm
Eyepiece Eye Relief 17mm
Eyepiece Manufacturer Series Televue Nagler
Eyepiece Weight 1 lb. 0.2 oz.
Field Stop 17.1mm
Number of Lens Elements & Groups 6 elements
Special Feature None
Comes with Dust Caps? Yes
Comes with Eye Guard? Yes
Included Items

Included Items

  • Televue 12mm Nagler Type 4 Eyepiece
  • Dust Caps
Questions & Answers

Product Questions

What is the overall length of the 12 mm eyepiece?
Is the 1.25" barrel removable?
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