Nikon Eyepiece for Astronomical Telescope NAV-17.5SW φ 56.5 x 94.5 mm 365 g New

Description

Nikon Eyepiece for Astronomical Telescope NAV-17.5SW φ 56.5 x 94.5 mm 365 g New
Description
Optical design that prioritizes performance
The eye relief does not stick to numbers, but the optical design that prioritizes performance and the lens barrel design that considers ease of use ensure that the distance from the practical target end face to the eye point is almost constant. You can use any eyepiece with the same feeling. In addition, the aberration of the exit pupil is satisfactorily removed, which reduces "blackout" and "coloring" when the eyes deviate from the eye point as much as possible, improving usability.
Suppresses harmful reflection by multi-coating
In order to eliminate stray light that is harmful to observation, a light-shielding diaphragm, light-shielding line, black paint, etc. are used properly and placed in appropriate places, and the lens surface is multi-coated to suppress harmful reflection and improve the transmittance, and other measures against stray light are taken.
Easy-to-grip knurled design
Silicone rubber, which is gentle on the skin, is used for the target rubber that comes into direct contact with the skin. An easy-to-grip knurled design reminiscent of Nikkor lenses.
Uses a light-shielding hood made of silicone rubber
A light-shielding hood made of silicone rubber is used to prevent ambient light in parking lots and during high-magnification observations where close contact is not possible. Unlike the normal "weapon type", it has a unique shape that can be used by spectacle wearers and flexibility that makes it difficult to transmit vibration. It is a removable type that can be removed when it is not needed.
Focal length (mm): 17.5
Number of components: 8 in 5 groups
Apparent field of view (°): 72.0
Eye relief (mm): 26
Field diameter (mm): φ22.0
Size (diameter x length) (mm): 56.5 x 94.5
Mounting size (mm) 31.7
Mass (weight) (g): 365
【Total:New】
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Note】
＊The condition of the item is described on the description page with photos, explanations, etc., so please check it before bidding.If you have any questions about size, accessories, etc., please feel free to message us.
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