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Questions & Answers
How will this eyepiece perform with 12-inch 3048 mm focal length SCT on Mars as it reaches opposition? Is the 2.5 mm focal length too much? Expert Answer

A 2.5mm Nagler Type 6 would produce 1,219X Magnification in that scope!

We recommend no more that 60X/inch of aperture and no more than 350X regardless of aperture. A 9mm Nagler Type 6 would yield 338X but usage would come down to the seeing conditions and if the temperature of the is close to ambient inside the tube.

Mark H.

by Mark H., Gear Expert, September 11, 2018

Product Discontinued by Manufacturer

TeleVue Nagler 2.5mm Type 6 Eyepiece EN6-2-5 has been discontinued by Tele Vue and is no longer available. Our product experts have helped us select these available replacements below.

Product Info for TeleVue Nagler 2.5mm Type 6 Eyepiece EN6-2-5

TeleVue Nagler 2.5mm Type 6 eyepieces EN6-2-5 are based on the original patented Nagler design. This new Televue Nagler 7-element design update for the short focal length Nagler deserves its own designation. Using different exotic materials, coating processes and design ingenuity, Al Nagler has massaged more eye-relief, contrast, and true field of view into the shorter focal length Nagler eyepieces, while maintaining the absolute sharpness of the originals.image

Specifications for Televue Nagler 2.5 mm Type 6 eyepieces EN6-2-5:

Focal Length:   2.5mm
Apparent Field of View:   82°
# of Elem.:   7
Barrel Dia.:   1 1/4"
Eye-relief:   12
Weight:   0.54 lb / 8.7 oz
Field Stop diameter:   3.4mm
Works in Bino Vue:   Y

Package Contents:

  • Televue Nagler 2.5mm Type 6 eyepiece

Specifications for TeleVue Nagler 2.5mm Type 6 Eyepiece EN6-2-5:

Focal Length: 2.5mm
Apparent Field of View: 82°
# of Elem.: 7
Barrel Dia.: 1 1/4in.
Eye-relief: 12
Weight: 0.54 lb
Field Stop diameter: 3.4mm
Works in Bino Vue: Y

Package Contents:

  • Televue Nagler 2.5mm Type 6 eyepiece
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