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Tele Vue Nagler 17 mm Type 4 is a wide-angle astronomical eyepiece belonging to the legendary Nagler series developed by Al Nagler – one of the most outstanding designers of observational optics. All models in this series are connected by a common idea: the maximum wide field of view while maintaining the highest comfort of observation.
The 17mm Type 4 is a seven-element optical design with an 82° field of view, providing excellent sharpness and contrast throughout the field. The lenses are made of high-quality optical glass with a selected refractive index, and their surfaces are covered with full multi-layer coatings (FMC). The darkened lens edges reduce reflections and improve contrast. The eyepiece features a long exit pupil distance, making it an excellent choice for people who wear prescription glasses.
Type 4 has the longest exit pupil distance of all the Nagler eyepieces, which also include the parfocal Type 6 eyepieces and the Type 5 models that provide the largest actual field of view. • 82° wide-angle eyepiece with a focal length of 17 mm
• 7-element construction with chromatic aberration correction
• full FMC coatings and darkened lens edges
• high observation comfort – exit pupil distance 17 mm
• compatible with Tele Vue type 5 and 6 eyepieces (Nagler series) • eyepiece series: Tele Vue Nagler, type 4
• optical system: 7-element
• apparent field of view (AFoV): 82°
• focal length: 17 mm
• Diaphragm diameter: 24.3 mm
• exit pupil distance: 17 mm
• eyecup: foldable
• coatings: full multi-layer (FMC)
• Frame diameter: 2"
• length: 104.1 mm
• Maximum diameter: 61 mm
• weight: 726 g • Tele Vue Nagler 17 mm Type 4 eyepiece 60 months
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