Tele Vue NP101is User Manual
Page 12
Tele Vue recommends choosing low and medium power eyepieces in ratios of field stop diameters. For
example, factors of 1.4 or 2.0. When choosing higher power eyepieces, use ratios of magnification.
NOTE: True Field in degrees = (Field Stop dia./Telescope Focal Length) X 57.3° *Indicates additional Dioptrx Adapter required
Tele Vue-NP101/NP101is
Focal
Length
(mm)
Type
Product Code
Apparent
Field (deg)
Field Stop Dia.
(mm)
Eye Relief
(mm)
Weight
(lb.)
Mag.
True
Field
(deg)
Exit
Pupil
(mm)
# of
Elem.
Dioptrx
Ready
2" Eyepieces for Wide True Fields
55
Plössl
EPL-55.0
50
46.0
38
1.1
9.8
4.88
10.3
4
Y
41
Panoptic
EPO-41.0
68
46.0
27
2.1
13.2
4.88
7.7
6
Y
31
Nagler 5
EN5-31.0
82
42.0
19
2.2
17.4
4.46
5.8
6
Y
35
Panoptic
EPO-35.0
68
38.7
24
1.6
15.4
4.11
6.5
6
Y
21
Ethos
ETH-21.0
100
36.2
15
2.3
25.7
3.84
3.9
-
Y
26
Nagler 5
EN5-26.0
82
35.0
16
1.6
20.8
3.71
4.9
6
Y
22
Nagler 4
EN4-22.0
82
31.1
19
1.5
24.5
3.30
4.1
7
Y
27
Panoptic
EPO-27.0
68
30.5
19
1.0
20.0
3.24
5.1
6
Y
17
Ethos
ETH-17.0
100
29.6
15
1.6
31.8
3.14
3.2
-
Y
20
Nagler 5
EN5-20.0
82
27.4
12
1.0
27.0
2.91
3.7
6
Y*
17
Nagler 4
EN4-17.0
82
24.3
17
1.6
31.8
2.58
3.2
7
Y
1¼" Eyepieces for Wide True Fields
40
Plössl
EPL-40.0
43
27.0
28
0.4
13.5
2.87
7.5
4
Y
32
Plössl
EPL-32.0
50
27.0
22
0.4
16.9
2.87
6.0
4
Y
24
Panoptic
EPO-24.0
68
27.0
15
0.5
22.5
2.87
4.5
6
Y*
13
Ethos
ETH-13.0
100
22.3
15
1.3
41.5
2.37
2.4
-
Y
16
Nagler 5
EN5-16.0
82
22.1
10
0.4
33.8
2.35
3.0
6
N
19
Panoptic
EPO-19.0
68
21.3
13
0.4
28.4
2.26
3.6
6
Y*
25
Plössl
EAP-25.0
50
21.2
17
0.3
21.6
2.25
4.7
4
N
17.3
Delos
EDL-17.3
72
21.2
20
0.9
31.2
2.25
3.2
-
Y
10
Ethos
ETH-10.0
100
17.7
15
1.1
54.0
1.88
1.9
-
Y
13
Nagler 6
EN6-13.0
82
17.6
12
0.4
41.5
1.87
2.4
7
Y*
14
Delos
EDL-14.0
72
17.3
20
0.9
38.6
1.84
2.6
-
Y
20
Plössl
EAP-20.0
50
17.1
14
0.2
27.0
1.81
3.7
4
N
12
Nagler 4
EN4-12.0
82
17.1
17
1.0
45.0
1.81
2.2
6
Y
1¼" Eyepieces for Medium Powers
12
Delos
EDL-12.0
72
15.0
20
0.9
45.0
1.59
2.2
-
Y
11
Nagler 6
EN6-11.0
82
14.9
12
0.4
49.1
1.58
2.1
7
Y*
10
Delos
EDL-10.0
72
12.7
20
0.9
54.0
1.35
1.9
-
Y
15
Plössl
EAP-15.0
50
12.6
10
0.2
36.0
1.34
2.8
4
N
9
Nagler 6
EN6-09.0
82
12.4
12
0.4
60.0
1.32
1.7
7
Y*
11
Plössl
EAP-11.0
50
9.1
8
0.1
49.1
0.97
2.1
4
N
1¼" Eyepieces for Higher Powers
8
Ethos
ETH-08.0
100
13.9
15
1.0
67.5
1.47
1.5
-
Y
6
Ethos
ETH-06.0
100
10.4
15
1.0
90.0
1.10
1.1
-
Y
8
Delos
EDL-08.0
72
9.9
20
1.0
67.5
1.05
1.5
-
Y
7
Nagler 6
EN6-07.0
82
9.7
12
0.5
77.1
1.03
1.3
7
Y*
4.7
Ethos SX
ETH-04.7
110
8.9
15
1.3
114.9
0.95
0.9
-
Y
6
Delos
EDL-06.0
72
7.6
20
1.0
90.0
0.81
1.1
-
Y
3.7
Ethos SX
ETH-03.7
110
7.0
15
1.1
145.9
0.75
0.7
-
Y
5
Nagler 6
EN6-05.0
82
7.0
12
0.5
108.0
0.74
0.9
7
Y*
8
Plössl
EAP-08.0
50
6.5
6
0.1
67.5
0.69
1.5
4
N
4.5
Delos
EDL-04.5
72
5.6
20
1.1
120.0
0.59
0.8
-
Y
3.5
Nagler 6
EN6-03.5
82
4.8
12
0.5
154.3
0.51
0.7
7
Y*
3.5
Delos
EDL-03.5
72
4.4
20
1.1
154.3
0.47
0.7
-
Y
2.5
Nagler 6
EN6-02.5
82
3.4
12
0.5
216.0
0.36
0.5
7
Y*
1¼" Zoom Eyepieces for Medium and Higher Powers
6-3
Nagler Zoom
ENZ-0306
50
5.1-2.6
10
0.3
90.0-
180.0
0.54-
0.28
1.1-
0.6
5
N
4-2
Nagler Zoom
ENZ-0204
50
3.3-1.7
10
0.4
135.0-
270.0
0.35-
0.18
0.7-
0.4
5
N