Products
Televue 20.0mm Nagler Type 5 - 2"
- $843.75
Enquire for more information or email us specifics at sales@astro.com.sg.
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82° Apparent Field Eyepieces
| 20-mm | |
| Model # | EN5-20.0 |
| Focal Length (mm) | 20 |
| Barrel Size (in.) | 2\" |
| Apparent Field of View (deg.) | 82 |
| Eye Relief (mm) | 12 |
| Weight (lb / oz) | 1.04 / 16.6 |
| Field Stop (mm) | 27.4 |
The 20mm Type 5 is a compact 1-pound, 2\" eyepiece that fills out the eyepiece line and is a worthy successor to the heaviest commercial eyepiece ever produced: the Nagler 20mm Type 2, which weighed-in at 2.3-lb. when introduced in 1986.
To achieve the full magnification range over 82° apparent field of view requires two types: Nagler Type-5 with focal lengths of 31, 26, 20, 16mm and Nagler Type-6 with focal lengths of 13, 11, 9, 7, 5, 3.5, 2.5mm.
The Type-5 permits the largest true field possible (31mm has 42mm field stop), while the shorter focal length Type-6 models are parfocal, with similiar size and weight and all with a comfortable 12mm eye relief.
The Type-4 models feature about 18mm of eye relief and with the \"instajust\" eyeguard are best for eyeglass wearers or Dioptrx users in their 22, 17, 12mm focal length range.
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