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Nikon 1.25" NAV-SW Eyepiece with 72° AFOV - 10mm # NAV-10SW

Nikon 1.25" NAV-SW Eyepiece with 72° AFOV - 10mm # NAV-10SW

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Nikon commemorated the International Year of Astronomy 2009 with the birth of their NAV-SW series eyepieces in five different focal lengths. Nikon NAV SWs eyepieces, based on their excellent eyepieces for Nikon spotting scopes, have evolved to meet the requirements of high level astronomical observation, with the deepest attention devoted to exquisite rendition of astronomical point sources of light, while also taking a chapter from the digiscope design world, which demands flat fields and sharp images right to the very edge of the field of view. The NAV SW design emphasizes suppression of field curvature and all astigmatism to bring about the maximum improvement in edge of field fidelity without sacrificing the quality of the image at the center of the field.

The compact Nikon NAV SWs are 72 degree FOV eyepieces that come with 1.25" barrels that are threaded for standard 1.25" astronomy filters. The comfortable eye relief specs for each eyepiece are designed to also harmonize with the optical performance of that eyepiece. Also, removal of exit pupil aberrations virtually eliminates any instance of kidney bean blackout effect, regardless of where the eye is placed during observation. The excellent color balance of the NAV SWs was derived through rigorous testing of this optical parameter on terrestrial objects, insuring the highest degree of planetary and lunar color rendition. Multicoatings on every optical surface make sure that these images are also as bright and otherwise distortion free as possible.

The Nikon NAV SW exterior design is somewhat reminiscent of the tried and true Nikkor lens design, with an attractive, high quality appearance, and rollets located around the entire circumference making the eyepieces easy and sure to grip, even in darkness or with gloved hands. A flexible silicone rubber eye shield (winged eyeguard) on the top of the eyepiece helps block streets lights and other annoying sources of light pollution, especially a help when viewing sensitive planetary and lunar surface details at high magnifications.

Nikon NAV SWs moisture resistant design will provide long years of constant and worry free service and viewing pleasure to discriminating astronomers in any observing environment worldwide.

The combination of the ideal optical qualities of a flat and wide 72 degree FOV that is sharp from edge to edge, excellent color rendition, comfortable eye relief intelligently designed to harmonize specifically with each eyepiece, a beautiful and compact body design, highest quality Japanese glass, multi-coatings and exterior materials, and a good selection of focal lengths makes the Nikon NAV SWs a true and new winner in the ever expanding world of 21st century astronomy.

Please Note: Nikon does not sell astronomical eyepieces directly in the US. We have teamed up with a leading tier 1 Nikon dealer from Japan to import these into the US. Together, we offer our US customers a limited one-year warranty on this product.

Eyepiece Series


Focal Length


Barrel Size

1.25" (31.7mm)

Apparent Field of View (Mfg Specified)


Filter Threads

Standard 1.25" Filter Thread (M28.5 x 0.6)

Eye Relief


Fully Multicoated

Lens Elements


Lens Groups

Blackend Lens Edges

Barrel Type
With safety undercut

Height (With Eyeguard Extended)

79mm / 3.11"

Rubber Eye Guard



10.6 oz / 300 g

Note: Occasionally, the product you receive might have a slightly different cosmetic appearance or labeling than what is shown. This can often change from batch to batch according to the whims of the manufacturer. However, you will always receive a brand new, original product as described above.

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Filed under: Eyepieces & Accessories