The Incomparable TeleVue Nagler
You may know there's a long history of naming eyepieces after their designers: Kellner, Erfle and Plossl, to name a few. Nagler eyepieces are no different. In the late 1970s, Al Nagler designed an eyepiece so radical that he dared attach his name to it. It’s easy to see why. In the late 1970s Al Nagler designed an eyepiece sufficiently radical that he dared attach his name to it. TeleVue Nagler eyepieces initiated the revolution toward ultra-wide field eyepieces, providing a tack-sharp image across an extremely generous 82 degree apparent field. Nagler eyepieces have been enhanced and refined over the years, dominating the market for ultra-wide field eyepieces for nearly three decades.
The book “The Backyard Astronomer” by Dickenson & Dyer says it best in this excerpt:
"Al Nagler of TeleVue caused a sensation when he introduced the Nagler in 1982. The Nagler's success can be attributed to two important innovations: an extremely wide apparent field of 82 degrees with outstanding sharpness and exceptionally comfortable eye relief for eyepieces of very short focal length...He designed his melding of eyepiece and Barlow to operate as a single unit; that is, the aberrations of one cancel out the aberrations of the other, producing exquisitely sharp images edge to edge over an unprecedentedly wide field of view. Nagler's background of optical-systems design for visual flight simulators and his interest in amateur astronomy created the perfect match for this breakthrough."
Benefits of Nagler Eyepieces
Naglers eyepieces accomplish what at the time was considered an incredible field of view by using six to seven lens elements, which allow for a field that is 64% wider than the ubiquitous Plossl eyepieces typically supplied with telescopes today. In fact, the field of view is so wide that viewers must physically move their heads to see it all, giving them a more comprehensive view of the night sky. On top of that, Nagler eyepieces offer excellent color correction with minimal field curvature.
Nagler eyepieces have been enhanced and refined over the years, dominating the market for ultra-wide field eyepieces for over three decades. They’re particularly convenient for use with Dobsonian telescopes when observing at higher magnifications since the wider field allows observers to track objects across the night sky for a longer period before needing to adjust the scope.
Types of Nagler Eyepieces
Nagler eyepieces come in several design types with different focal lengths. Each Nagler Type refers to a different optical design and comes with different focal lengths:
- TeleVue Nagler Type 4: The Type 4 design is optimized to provide long eye relief. Each eyepiece is designed slightly differently To achieve the desired eye relief and focal length. Type 4 eyepieces come in focal lengths of 22, 17 and 12mm and are renowned for their more comfortable, eye-friendly design.
- TeleVue Nagler Type 5: The Nagler type 5 is an example of a scaled design, meaning each eyepiece has the same components that simply scale up or down with the focal length. The eye relief also scale proportionately to the foacla length. The sizes included in the Type 5 line of the Televue Nagler are 31, and 16mm.
- TeleVue Nagler Type 6: The Nagler Type 6 series holds two design parameters constant across the line: the apparent field of 82 degrees and eye relief of 16 mm. to the Type 6 series includes focal lengths of 13, 9, 7, 5, and 3.5mm
Shop Skies Unlimited
At Skies Unlimited, we offer a variety of eyepieces for sale, especially the Nagler and other fine eyepieces from TeleVue. When it comes to recommending the best telescope eyepiece for a specific application, we never hesitate to include the Nagler eyepiece in our list of candidates.
Since our establishment in 2004, we’ve dedicated ourselves to making astronomy an accessible hobby for everyone. For quality advice, simply speak to one of our team members — each one is an amateur astronomer ourselves and can provide the practical advice you need to choose the best equipment for your needs.
Call Skies Unlimited today or visit our Pottstown, Pa., location to talk with us about our eyepiece selection and learn how you can get free shipping on your next order. Shop Skies Unlimited today!