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Tele Vue Oculars Specifications
Prod.
Code		 1FL
(mm)		 Eyepiece Type Barrel
(in.)		 2E / G 3AF 4G 5ER
(mm)		 Field
Stop
(mm)		 6Eyepiece Dimensions (in.) Weight
(lb / oz)
A B C D E F
 EPL-55.0 55 Plössl 2" 4 / 2 50  38 46 3  1.4 2.3  1.16 1.13 / 18.1
 EPL-40.0 40 Plössl 1¼" 4 / 2 43  28 27 1.8 0.9  1.6  0.7 0.41 / 6.6
 EPL-32.0 32 Plössl 1¼" 4 / 2 50 B 22 27 1.9 0.9  1.6  0.25 0.39 / 6.2
 EAP-25.0 25 Plössl 1¼" 4 / 2 50 B 17 21.2 1.6 0.9  1.3  0.25 0.27 / 4.3
 EAP-20.0 20 Plössl 1¼" 4 / 2 50 B 14 17.1 1.2 0.9  1.3  0.25 0.19 / 3.0
 EAP-15.0 15 Plössl 1¼" 4 / 2 50 B 10 12.6 0.9 0.9  1.3  0.25 0.16 / 2.6
 EAP-11.0 11 Plössl 1¼" 4 / 2 50 B 8 9.1 0.5 0.9  1.4  0.25 0.14 / 2.2
 EAP-08.0 8 Plössl 1¼" 4 / 2 50 B 6 6.5 0.4 0.9  1.4  0.25 0.11 / 1.8
 ERD-18.0 18 Radian 1¼" 6 / 4 60 B 20 18.3 1.4 1.4  1.8  0.25 0.49 / 7.8
 ERD-14.0 14 Radian 1¼" 6 / 4 60 B 20 14.4 1.6 1.4  1.8  0.25 0.54 / 8.7
 ERD-12.0 12 Radian 1¼" 6 / 4 60 B 20 12.6 1.8 1.1  1.8  0.25 0.53 / 8.5
 ERD-10.0 10 Radian 1¼" 6 / 4 60 B 20 10.5 1.9 1.2  1.8  0.25 0.54 / 8.7
 ERD-08.0 8 Radian 1¼" 6 / 4 60 B 20 8.3 2.2 1.2  1.8  0.25 0.60 / 9.6
 ERD-06.0 6 Radian 1¼" 7 / 5 60 B 20 6.3 2.5 1.3  1.8  0.25 0.79 / 12.6
 ERD-05.0 5 Radian 1¼" 7 / 5 60 B 20 5.3 2.6 1.2  1.8  0.25 0.80 / 12.8
 ERD-04.0 4 Radian 1¼" 7 / 5 60 B 20 4.2 2.6 1  1.8  0.25 0.76 / 12.1
 ERD-03.0 3 Radian 1¼" 7 / 5 60 B 20 3.3 2.7 1.1  1.8  0.25 0.77 / 12.3
 EPO-41.0 41 Panoptic 2" 6 / 4 68 A 27 46 3.8  1.1 3  0.27 2.10 / 33.6
 EPO-35.0 35 Panoptic 2" 6 / 4 68 C 24 38.7 3.4  1.2 2.6  0.17 1.60 / 25.6
 EPO-27.0 27 Panoptic 2" 6 / 4 68 A 19 30.5 2.4  1.2 2.1 1.3 0.29 1.03 / 16.4
 EPO-24.0 24 Panoptic 1¼" 6 / 4 68 B 15 27 2.1 0.8  1.9  0.25 0.51 / 8.2
 EPO-22.0 22 Panoptic 2" & 1¼" 6 / 4 68 A 15 25 2 1.7 1 2.1  0.27 0.96 / 15.4
 EPO-19.0 19 Panoptic 1¼" 6 / 4 68 B 13 21.3 1.7 0.9  1.7  0.25 0.41 / 6.6
 EPO-15.0 15 Panoptic 1¼" 6 / 4 68 B 10 17.1 1.3 0.9  1.4  0.25 0.30 / 4.8
 EN5-31.0 31 Nagler 5 2" 6 / 4 82  19 42 3.9  1.5 3.3  -0.38 2.20 / 35.2
 EN5-26.0 26 Nagler 5 2" 6 / 4 82  16 35 3  1.5 2.8  -0.05 1.60 / 25.6
 EN4-22.0 22 Nagler 4 2" 7 / 5 82  19 31.1 2.4  1.5 2.4  -0.29 1.50 / 24.0
 EN5-20.0 20 Nagler 5 2" 6 / 4 82 C 12 27.4 2.1  1.3 2.1  0.15 1.04 / 16.6
 EN4-17.0 17 Nagler 4 2" 7 / 5 82  17 24.3 2.6  1.5 2.4  -0.03 1.60 / 25.6
 EN5-16.0 16 Nagler 5 1¼" 6 / 4 82 B 10 22.1 1.5 1.2  1.7  0.28 0.44 / 7.1
 EN6-13.0 13 Nagler 6 1¼" 7 / 4 82 B 12 17.6 1.6 1.3  1.6  0.25 0.40 / 6.4
 EN4-12.0 12 Nagler 4 2" & 1¼" 6 / 4 82  17 17.1 2.3 1.8 1 2.4 1.2 0.78 1.01 / 16.2
 EN6-11.0 11 Nagler 6 1¼" 7 / 4 82 B 12 14.9 1.7 1.2  1.6  0.25 0.42 / 6.7
 EN6-09.0 9 Nagler 6 1¼" 7 / 4 82 B 12 12.4 1.9 1.2  1.6  0.25 0.42 / 6.7
 EN6-07.0 7 Nagler 6 1¼" 7 / 4 82 B 12 9.7 2.2 1.2  1.6  0.25 0.50 / 8.0
 EN6-05.0 5 Nagler 6 1¼" 7 / 4 82 B 12 7 2.1 1.2  1.6  0.25 0.49 / 7.9
 ENA-04.8 4.8 Nagler 1¼" 7 / 4 82 B 7 6.6 1.3 1.1  1.3  0.25 0.33 / 5.3
 EN6-03.5 3.5 Nagler 6 1¼" 7 / 4 82 B 12 4.8 2.2 1.2  1.6  0.25 0.53 / 8.5
 EN6-02.5 2.5 Nagler 6 1¼" 7 / 4 82 B 12 3.4 2.3 1.2  1.6  0.25 0.54 / 8.7
 ENA-07.0 7 Nagler 1¼" 7 / 4 82 B 10 9.4 1.9 1.1  1.3  0.25 0.41 / 6.5
 ENZ-0204 2 - 4 Nagler Zoom 1¼" 5 / 3 50 B 10 1.7 - 3.3 0.9 1.6  1.7  0.25 0.36 / 5.7
 ENZ-0306 3 - 6 Nagler Zoom 1¼" 5 / 3 50 B 10 2.6 - 5.1 0.7 1.6  1.7  0.25 0.33 / 5.3
 CSZ-0824 8 - 24 Click Stop Zoom 1¼" 7 / 4 55 - 40  15 - 20 7.6 - 16.7 2.6 1  1.7  0.1 0.49 / 7.9
Prod.
Code		 1FL
(mm)		 Eyepiece Type Barrel
(in.)		 2E / G 3AF 4G 5ER
(mm)		 Field
Stop
(mm)		 6Eyepiece Dimensions (in.) Weight
(lb / oz)
A B C D E F

  Table Footnotes

1FL: Focal Length

2E / G: # Lens Elements / # Groups

3AF: Apparent Field of View

4G: Parfocal Group, eyepieces with the same letter are approximately parfocal -- require little (if any) refocusing when used together.

5ER: Eye Relief

6Eyepiece Dimensions: see diagram right
  A. Height of barrel above reference surface
B. Height of 1¼" barrel
C. Height of 2" barrel
D. Diameter of black barrel
E. Depth of 1¼" barrel
F. Approx. location of field stop (negative number is above reference surface)

  Table Eyepiece Notes

  • All Tele Vue eyepieces listed have full multi-coatings, blackened lens edges, high index glasses, fold-down eyeguards, and filter threads. They are all based on patented designs by Al Nagler and are individually tested to be diffraction-limited on-axis.
    All Nagler and Radian eyepieces have internal focal planes. Field stop diameters and locations are "effective". Radian and Nagler type-4 eyepieces have "Instajust Eyeguards," and "pupil guide" accessory.
  • The 55mm Plössl and 41mm Panoptic eyepieces have an adjustable height (removable) eyeguard.
  • Also available: 2X and 3X parfocal 1-1/4" Barlows; parfocal 2.5x and 5x 1-1/4" Powermates; 2X Big Barlow, 2x and 4x Powermates for 2" focusers. Use Paracorr (1.15X) to correct fast parabolic "Dob/Newts", dramatically sharpens field to take full advantage of Tele Vue eyepiece capabilities.
  • All dual barrel eyepieces work equally well in 1-1/4" or 2" focusers.
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