Before placing your order, please click here for important shipping and delivery information.

Important Notice regarding the authenticity and safety of Baader, Thousand Oaks, and other solar products sold by AgenaAstro.  Please click here.

Nikon 1.25" NAV-SW Eyepiece with 72° AFOV - 17.5mm # NAV-17.5SW

Our Price: $360.00
Free shipping for this item in the US Click here for more info

Continental US Customers:
All items we sell ship for free within the Continental US. Shipping will be via the cheapest shipping method which will vary depending on the items in your order. During checkout, you may also be shown other optional faster shipping choices.

US Customers in Hawaii and Alaska:
Free shipping applies to almost all products. A few large telescopes and mounts are excluded from this free shipping offer. For these items, please contact us to obtain a shipping quote before you check out using the online shopping cart.

International Customers:
Free shipping does not apply to international orders. During check-out, you will be presented with several shipping choices and costs. However, the export of some items may be restricted outside the US due to size or manufacturer restrictions.

In Stock (4 Available)
Ships by Next Business Day
Our Product ID: E-NI-NAV-17.5SW
Manufacturer SKU: NAV-17.5SW
Item Can Ship: Worldwide
Nikon 1.25" NAV-SW Eyepiece with 72° AFOV - 17.5mm # NAV-17.5SW

More Views

Product Details

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 NAV-SW
Focal Length 17.5mm
Barrel Size 1.25" (31.7mm)
Apparent Field of View (Mfg Specified) 72°
Eye Relief (Designed) 26mm
Filter Threads Standard 1.25" Filter Thread (M28.5 x 0.6)
Coatings Fully Multicoated
Lens Elements 8
Lens Groups 5
Blackened Lens Edges Yes
Barrel Safety Recess Yes
Barrel Type With safety undercut
Protective Plastic Storage Container Yes - Free Agena Eyepiece Container
Protective Plastic Storage Container Size Agena 65x80mm
Height (With Eyeguard Extended) 94.5mm / 3.72"
Maximum Width 56.5mm / 2.22"
End Caps 2
Rubber Eye Guard Yes
Weight 12.9 oz / 365 g
Country of Manufacture Japan