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f Kowa Spotting Scope TSN66A Prominar incl. TE-11WZ II WA Oculair
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Kowa Spotting Scope TSN66A Prominar incl. TE-11WZ II WA Oculair

Do you like to get out in nature? And want to get around easily? Then Kowa has added a new spotting scope to their prominar series. The Kowa Spotting Scope TSN-66A Prominar is a compact variant with the same fluorite crystal lenses and coatings as the well-known TSN-88A. So you are assured of even higher light transmission resulting in a spotting scope that delivers even higher levels of light wavelength transmission than comparable 66mm objective lens models. It provides nature's most natural colour across the entire colour spectrum.

In addition to its compact size, you benefit from a lower weight due to a 100% magnesium alloy body and it is also stronger overall. So the TSN-66A is easy to carry and has a fully waterproof and nitrogen-filled body. An upgraded Kowa KR coating on the optics makes the scope incredibly reliable and robust.

Like the TSN-88 and TSN-99 variants, the body features a pure fluorite crystal lens which, when combined with a Kowa XD lens, delivers superior low-light performance. This special combination, plus enhanced optical coatings virtually eliminates chromatic aberration, even at high magnification. Because the TSN-66A is equipped with a dual focusing mechanism, the image can be quickly and accurately focused with just your index finger - in just a few fluid revolutions. The fine focusing mechanism provides the final control to view the image razor-sharp.

Kowa TSN-66A with TE-11WZ II WA eyepiece

This kit comes with the Kowa TE-11WZ II wide-angle eyepiece. This eyepiece has a magnification of 25x-60x and features two XD lenses, so the images are displayed with excellent sharpness. The eyepiece is fully waterproof and equipped with a Twist-up eyepiece ring with three positions. This allows you to adjust the distance between your eye and the eyepiece. In this way, both spectacle wearers and users that do not wear glasses have a pleasant viewing experience.

Fluorite Crystal "Prominar" Lens

Chromatic aberration occurs due to the diffusion of light and the different wavelengths of light that concentrate at different positions, which can result in a red or purple border around the subject. The optimal optical material to minimize chromatic aberration is Fluorite Crystal. For the convex lens of the TSN-66A/66S, a Fluorite Crystal with extremely low dispersion characteristics is used. Instead of an ordinary optical glass lens, the hollow lens in combination with the Fluorite Crystal lens is made of glass with special dispersive properties to further reduce chromatic aberration. This combination virtually eliminates chromatic aberration and redefines the standards for color brilliance.

Fluorite crystal is only used in the top models of Kowa.

Key features Kowa TSN-66A Prominar:

  • 66mm large fluorite crystal lens
  • The fluorite used as an optical lens is an artificially grown monocrystal with "ultra-low dispersion", a property that ordinary optical glass does not have. It is an ideal lens material that almost completely eliminates chromatic aberration (colour blurring). The fluorite crystal produced by the advanced processing technology Kowa has built up over the years guarantees the ultimate viewing experience.
  • Dual focus mechanism (Quick and fine focusing)
    The fast focus, with a large and easy-to-turn knob, will focus in two revolutions from infinity to five meters. The fine focus, with smooth movements and great precision, is extremely useful at high magnifications and for digiscoping.
  • Fully Waterproof and Nitrogen-Proof
    The body is completely sealed to protect it. The robust construction can withstand the toughest conditions. This provides confidence and a sense of security.
  • KR Coating
    The objective lens benefits from enhanced protection by the upgraded KR coating. The KR coating actively repels dirt, moisture and dust from the surface.
  • Sun shade
    A smoothly rotating sun shade helps eliminate glare and also reduces the exposure of the objective lens to the elements, such as moisture, grit and sand.
  • Eyepiece release button
    To release the eyepiece smoothly, the release button has been redesigned. This makes it even easier to quickly change the eyepiece or adapter without compromising a secure connection to the body.
  • Strong, lightweight and portable
    Thanks to a 100% magnesium alloy body, the TSN-66 Prominar series is one of the most compact and lightweight spotting scopes of its size. A fully waterproof and nitrogen-sealed housing plus Kowa KR coating on the optics makes the spotting scope reliably robust.
    Another great advantage of magnesium alloy is that there is no turbulence in the body. The light rays pass straight through the body and the image is incredibly quiet.
  • Filter thread
    There is a 72mm filter thread on the body of the TSN-66A, which can be used to add a protective or UV filter for enhanced protection.
    The sun shade can still be used even with a filter.
  • Designed for digiscoping
  • 100% compatible with the KOWA SYSTEM. Easily change eyepieces, accessories and use digiscoping adapters for DSLR cameras and smartphones. Create a truly flexible optical instrument for many applications.
  • 10-year warranty

Expand your Kowa Spotting Scope Body TSN-66A with the right accessories:

(The accessories listed can be ordered via optional accessories)


An eyepiece should not be missing when purchasing a Spotting Scope. Without an eyepiece you can't see anything. Below is an overview of the eyepieces that fit the TSN-66A with the corresponding specifications:

  TE-11WZ II TE-80XW
Magnification 25x 60x 35x WIDE
Eye relief in mm 17,0 17,0 17,0
Exit pupil in mm 2,6 1,1 1,9
Brightness 6,8 1,2 3,6
Twilight factor 40,6 62,9 48,1
Field of view in ° 2,4   1,3 2,6 
Field of view / 1000m in m 42,0 23,0 45,0



When a Kowa TSN-EX16 extender is placed between the Kowa TSN-66A and the eyepiece, the magnification is increased by as much as 1.6 times. In combination with the TE-11WZ eyepiece, a magnification of 40-96x can now be achieved.

The video shows how easy it is to place the extender between the eyepiece and the Kowa spotting scope.

Astro Adapters

With the use of a Kowa Astronomy adapter, the TSN-66A can also be used for night-time celestial observation and photography. For this purpose a universal 1.25" astro eyepiece can be used.

Two variants are available; the TSN-AS1.25K has knurled screws with which eyepieces can be tightened by hand. This allows you to quickly change eyepieces. The TSN-AS1.25G is supplied with an Allen key. The advantage is that there are no protruding screws visible.
When the TSN-EX16 extender is combined with an Astro adapter, the TSN-66A can even be used for deep sky observations.

The video shows how easy it is to mount the astro adapters to the Kowa spotting scope with a 1.25" eyepiece.

Digiscoping Adapter

It is also possible to use your Kowa TSN-66A as a powerful telephoto lens in combination with your DSLR or system camera or even in combination with your smartphone. In this way you will be able to capture the most detailed and vivid photos of subjects you would otherwise not be able to get close enough to.

By using the TSN-PA7A, you connect the TSN-66A directly to your DSLR camera by means of an optional T2 ring. This creates a powerful yet lightweight and compact telephoto lens compared to traditional telephoto lenses.

Designed for use with Kowa's TE-11WZ II zoom eyepiece, the design makes full use of the eyepiece's zoom range, up to a focal length of 2570mm.

The video shows how easy it is to place the TSN-PA7A over the eyepiece of the Kowa spotting scope.
The TSN-DA10 is perfect for the compact and lightweight Micro Four Thirds cameras. Using the TSN-DA10 and an optional adapter ring, everything is ready for use within a minute. The optional adapter ring is available in various sizes, depending on the filter size of your lens: AR28/30/30.5/37/43/46/52/55/58/62/72mm.
The video shows how easy it is to connect the TSN-DA10 to the spotting scope.
Smartphone Adapters
If you would like to make photo and video recordings with your smartphone, this can be done by using a Kowa Smartphone adapter which is specially made for your smartphone. This smartphone adapter is a protective cover that can remain in place around your smartphone and offers protection against falls and knocks.

This smartphone adapter simply slides onto the eyepiece of the TSN-66A by means of a TSN-AR11WZ adapter ring and the whole thing is ready for use.
The video shows how easy it is to slide the smartphone adapter onto the eyepiece of the Kowa spotting scope.

If no adapter for your smartphone is available, please inform us about this. In many cases it is no problem for Kowa to develop an adapter for your smartphone.

Protective equipment

To protect your valuable Kowa TSN-66A, you can choose to complete it with the accessories listed below:

  • Kowa TSN-CV88 Eyepiece protector
    This eyepiece protector prevents scratching of the eyepiece lens or its coating due to unfavourable conditions or transport. By using an eyepiece protector, costly repairs can be prevented.

Tripod use

When looking through the spotting scope for long periods, it is wise to use a tripod. A tripod allows you to fully focus on the subject. The Kowa TSN66A spotting scope is equipped with both 1/4" and 3/8" threaded connections. However, it is important to buy a tripod that has the right height and perhaps choose one with a fluid-damped head. A tripod with a fluid-cushioned head moves more fluidly and prevents the spotting scope from overshooting once you have the subject in focus.



  • 1x TSN-66A body
  • 1x TE-11WZ II 25-60x Zoom eyepiece
  • 1x Objective lens cap
  • 1x Eyepiece cap

Currently out of stock.
Expected delivery time: 2 weeks
Email me when in stock.

Price incl. VAT: € 2.698,00

Article number:Help441665
Diameter Objective:Help66 mm
Filter Thread:Help72 mm
Lens type:HelpFluorite
Use:HelpTravel, Hunting, Birdwatching, Plane spotting, Astronomy
Exit pupil:Help2.6 mm (25x) ~ 1.1mm (60x)
Lenscoating:HelpFully Multi Coated
Glass material:HelpBaK-4
Length:Help36,5 cm
Weight:Help1500 g
Warranty:Help10 years
Brightness:Help6,8 (25x) ~ 1,2 (60x)
Twilight Factor:Help40,6 (25x) ~ 62,9 (60x)
Field of view at 1000m:Help42 m (25x) ~ 23 m (60x)
Focusing:HelpCourse- and fine tuning
Close focus distance:Help3.5 meters

Anyone looking for pure quality cannot ignore KOWA. With a range of binoculars and spotting scopes from the absolute top segment, Kowa offers everything for the demanding birder and nature lover. With XD lenses to full fluorite crystal lenses, Kowa binoculars have unprecedented clarity, detail reproduction and edge-to-edge sharpness. With numerous digiscoping solutions, it is also easier than ever to take photos with your smartphone or camera while using your binoculars or spotting scope as a telephoto lens.






KOWA in short:

• Absolute top-quality binoculars and spotting scopes
• 100% fluorite-crystal lenses on flagship models
• Easy digiscoping: taking pictures through the scope with your camera or smartphone
• The brand for birdwatchers, nature lovers, astronomers, plane spotters and researchers
• We offer a 10-year warranty on Kowa products

Click on the links to check out all of Kowa's binoculars and spotting scopes.

Flagship dealers

In the Netherlands BENEL has several KOWA Flagship Dealers. In the stores of these Flagship Dealers you can go for your Kowa binoculars, spotting scopes and digiscoping solutions. They offer the opportunity to test or view the products and can also provide you with the best advice for the purchase of a Kowa binocular or accessory.

Check out here all our Kowa Flagship Dealers from Holland.

Kowa ambassador

Bird watcher Ariaan is the ambassador of Kowa in the Netherlands. Ariaan has been a bird spotter for over 30 years. Over all those years, he has seen more than 200 species of birds. During the bird excursions that Ariaan offers, you can literally see them fly! You'll learn everything about birds at the most beautiful locations. And you'll see them from very near, thanks to Kowa's optics. With the spotting scopes and binoculars, Ariaan and his students observe even the tiniest details.