Eyepiece Specifications
TeleVue.com: Article > Eyepiece Specifications

All Tele Vue eyepieces listed have proprietary tuned full multi-coatings, blackened lens edges, high index glasses, fold-down eyeguards, rubber grip rings, cover for the eyeguard, an undercut in the barrel for extra locking security and filter threads. All Tele Vue eyepiece lines are proprietary, in-house designs manufactured to our specifications and tolerances. Every eyepiece is individually tested at Tele Vue to ensure it meets our high optical and cosmetic standards.

Prod.
Code
1FL
(mm)
Eyepiece
Type
Barrel
(in.)
2E / G 3AF 4G 5ER
(mm)
Field
Stop
(mm)
6Eyepiece Dimensions (in.) Weight
(lb / oz)
Recommended
A B C D E F Bino Vue DIOPTRX
Digiscoping
 EPL-55.0 55 Plössl 2" 4 / 2 50  38 46 3  1.4 2.3  1.16 1.13 / 18.1   Y
 EPO-41.0 41 Panoptic 2" 6 / 4 68 A 27 46 3.8  1.1 3  0.27 2.10 / 33.6   Y
 EPL-40.0 40 Plössl 1¼" 4 / 2 43  28 27 1.8 0.9  1.6  0.7 0.41 / 6.6 Y Y
 EPO-35.0 35 Panoptic 2" 6 / 4 68 C 24 38.7 3.1  1.2 2.6  0.17 1.60 / 25.6   Y
 EPL-32.0 32 Plössl 1¼" 4 / 2 50 B 22 27 1.9 0.9  1.6  0.25 0.39 / 6.2 Y Y
 EN5-31.0 31 Nagler 5 2" 6 / 4 82  19 42 3.9  1.5 3.3  -0.38 2.20 / 35.2   Y
 EPO-27.0 27 Panoptic 2" 6 / 4 68 A 19 30.5 2.4  1.2 2.1  0.29 1.03 / 16.4   Y
 EN5-26.0 26 Nagler 5 2" 6 / 4 82  16 35 3  1.5 2.8  -0.05 1.60 / 25.6   Y
 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 Y N
 EPO-24.0 24 Panoptic 1¼" 6 / 4 68 B 15 27 2.1 0.8  1.9  0.25 0.51 / 8.2 Y Y*
 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   Y
 ETH-21.0 21 Ethos 2"  /  100  15 36.2 4.3  1.62 2.95  -0.38 2.25 / 36.0   Y
Prod.
Code
1FL
(mm)
Eyepiece
Type
Barrel
(in.)
2E / G 3AF 4G 5ER
(mm)
Field
Stop
(mm)
6Eyepiece Dimensions (in.) Weight
(lb / oz)
Recommended
A B C D E F Bino Vue DIOPTRX
Digiscoping
 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   Y*
 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 Y N
 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 Y Y*
 EDL-17.3 17.3 Delos 1¼"  /  72  20 21.2 3.1 1.1  2.2  -0.23 0.90 / 14.4 Y Y
 ETH-17.0 17 Ethos 2"  /  100  15 29.6 4.5  1.4 2.4  -0.39 1.55 / 24.8   Y
 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   Y
 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 Y N
 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 Y N
 EDL-14.0 14 Delos 1¼"  /  72  20 17.3 3.5 0.9  2.2  -0.23 0.90 / 14.4 Y Y
 ETH-13.0 13 Ethos 2" & 1¼"  /  100  15 22.3 4 1.6 1.1 2.5 1.1 0.27 1.30 / 20.8 Y Y
 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 Y Y*
 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   Y
 EDL-12.0 12 Delos 1¼"  /  72 B 20 15 3.1 1.2  2.2  0.25 0.90 / 14.4 Y Y
 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 Y Y*
Prod.
Code
1FL
(mm)
Eyepiece
Type
Barrel
(in.)
2E / G 3AF 4G 5ER
(mm)
Field
Stop
(mm)
6Eyepiece Dimensions (in.) Weight
(lb / oz)
Recommended
A B C D E F Bino Vue DIOPTRX
Digiscoping
 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 Y N
 ETH-10.0 10 Ethos 2" & 1¼"  /  100  15 17.7 3.8 1.6 1.1 2.3 1.1 0.27 1.10 / 17.6 Y Y
 EDL-10.0 10 Delos 1¼"  /  72 B 20 12.7 3.5 1.1  2.2  0.25 0.90 / 14.4 Y Y
 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 Y Y*
 ETH-08.0 8 Ethos 2" & 1¼"  /  100  15 13.9 3.3 1.7 0.94 2.1 1.2 0.7 0.95 / 15.2 Y Y
 EDL-08.0 8 Delos 1¼"  /  72 B 20 9.9 3.6 1.2  2.2  0.25 1.00 / 16.0 Y Y
 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 Y N
 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 Y Y*
 ENZ-0306 6-3 Nagler Zoom 1¼" 5 / 3 50 B 10 5.1-2.6 0.7 1.6  1.7  0.25 0.33 / 5.3 Y N
 ETH-06.0 6 Ethos 2" & 1¼"  /  100  15 10.4 3.5 1.5 0.94 2.1 1.1 0.7 0.97 / 15.5 Y Y
 EDL-06.0 6 Delos 1¼"  /  72 B 20 7.6 4.1 1.1  2.2  0.25 1.00 / 16.0 Y Y
 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 Y Y*
Prod.
Code
1FL
(mm)
Eyepiece
Type
Barrel
(in.)
2E / G 3AF 4G 5ER
(mm)
Field
Stop
(mm)
6Eyepiece Dimensions (in.) Weight
(lb / oz)
Recommended
A B C D E F Bino Vue DIOPTRX
Digiscoping
 ETH-04.7 4.7 Ethos SX 2" & 1¼"  /  110  15 8.94 5.4 0.9  2.2  0.25 1.30 / 20.8 Y Y
 EDL-04.5 4.5 Delos 1¼"  /  72 B 20 5.6 4 1.1  2.2  0.25 1.10 / 17.6 Y Y
 ENZ-0204 4-2 Nagler Zoom 1¼" 5 / 3 50 B 10 3.3-1.7 0.9 1.6  1.7  0.25 0.36 / 5.7 Y N
 ETH-03.7 3.7 Ethos SX 2" & 1¼"  /  110  15 7.04 5 1.1  2.2  0.25 1.10 / 17.6 Y Y
 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 Y Y*
 EDL-03.5 3.5 Delos 1¼"  /  72 B 20 4.4 4.2 1.1  2.2  0.25 1.10 / 17.6 Y Y
 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 Y Y*

Table Notes

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
*Additional adapter required for Dioptrx
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)

Tele Vue Eyepiece Notes

  • All Nagler, Radian, Ethos and Delos 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. Delos eyepieces have an adjustable/lockable eyeguard.

  • The 55mm Plössl and 41mm Panoptic eyepieces have an adjustable height (removable) eyeguard.

  • Also available: 2X and 3X parfocal 1¼" Barlows; parfocal 2.5x and 5x 1¼" 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 1¼" or 2" focusers.

Discontinued or Unavailable Eyepiece Archive

For your convenience, this table lists field stops for currently unavailable eyepieces.

Prod.
Code
Eyepiece Field
Stop
(mm)
ENA-04.84.8 Nagler6.6
ENA-07.07 Nagler9.4
ENA-09.09 Nagler12.3
ENA-11.011 Nagler14.9
ENA-13.013 Nagler17.8
EN2-12.012 Nagler 216.4
EN2-16.016 Nagler 221.9
EN2-20.020 Nagler 227.4
EWF-15.015 Wide Field15.4
EWF-19.019 Wide Field19.6
EWF-24.024 Wide Field24.7
EWF-32.032 Wide Field33
EWF-40.040 Wide Field41.2
EPO-15.015 Panoptic17.1
EPO-22.022 Panoptic25
ERD-05.05 Radian5.3
ERD-06.06 Radian6.3
ERD-08.08 Radian8.3
ERD-10.010 Radian10.5
ERD-12.012 Radian12.6
ERD-14.014 Radian14.4
ERD-18.018 Radian18.3
EPL-07.47.4 Plössl6.2
EPL-10.510.5 Plössl8.7
EPL-13.013 Plössl10.8
EPL-17.017 Plössl14.3
EPL-21.021 Plössl18
EPL-26.026 Plössl22.1


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