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f Kowa Spotting Scope TSN-99A Prominar Kit with TE-11WZ II WA Eyepiece
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Kowa Spotting Scope TSN-99A Prominar Kit with TE-11WZ II WA Eyepiece

The Kowa Spotting Scope TSN-99A Prominar is the new flagship of Kowa. The TSN-99A is equipped with a large 99mm pure fluorite crystal objective lens, which in combination with a Kowa XD lens delivers superior performance in low light. This special combination, combined with the improved optical coatings, virtually eliminates chromatic aberration, even at high magnifications. Because the TSN-99A is equipped with a dual focus mechanism, the image can be focused with just a forefinger faster and more accurately in just a few smooth revolutions. The fine focus mechanism provides the final control to view the image razor sharp.

Because the Kowa TSN-99A uses a 100% magnesium alloy, it is a compact and lightweight spotting scope in its class. The TSN-99A is easy to carry and has a fully waterproof and nitrogen sealed housing with Kowa KR coating on the optics. This makes the binoculars reliably robust.

Kowa TSN-99A with TE-11WZ II WA eyepiece

This kit comes with the Kowa TE-11WZ II wide angle eyepiece. This eyepiece has a magnification of 30x-70x and features two XD lenses, so the images are displayed with excellent sharpness. The eyepiece is fully waterproof and features 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 non-glasses wearers have a pleasant viewing experience.

"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-99A/99S, 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-99A Prominar:

  • Large 99mm 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.
  • Eyepiece lock mechanism
    The eyepiece bayonet mount now has an attractive feature. An eyepiece locking mechanism has been added to the holder to prevent the eyepiece from being lost or unexpectedly falling out.
  • Strong, lightweight and portable
    Thanks to a 100% magnesium alloy body, the TSN-99 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.
  • 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-99A 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-99A with the corresponding specifications:

  TE-11WZ II TE-80XW
Magnification 30x 70x 40x WIDE
Eye relief in mm 17,0 17,0 17,0
Exit pupil in mm 3,3 1,4 2,5
Brightness 10,9 2,0 6,3
Twilight factor 54,1 78,6 59,3
Field of view in °      
Field of view / 1000m in m 35,0 20,0 37,0



When a Kowa TSN-EX16 extender is placed between the Kowa TSN-99A 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-99A 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-99A 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-99A 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-99A 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-99A 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-99A, you can choose to complete it with the accessories listed below:

  • Kowa C-991 water-repellent Stay-On Bag
    The water-repellent bag has been specially designed for the Kowa TSN-99A and provides good protection during use and on the move. It comes with a shoulder strap that allows the spotting scope to be carried close at hand at all times and allows quick observation. The bag can remain wrapped around the scope while in use. The covers of the objective lens and eyepiece can be removed very quickly and all controls remain accessible.
  • 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.
  • Kowa TP-105FT Protective filter
    Using a protective filter for the lens reduces the risk of damage to the lens and avoids costly repairs. This can extend the life of the spotting scope. The Kowa TP-105FT protective filter has oil and water repellent coatings and ensures that sand and sea salt do not get on the lens. This keeps the objective lens with the special coatings undamaged.

Damage to the objective lens can drastically reduce optical performance, which also causes costly repairs. Precisely because the TSN-99A is equipped with a lens made of pure fluorite crystal. Often, the only option left is to completely replace the entire lens.That is why using protection is advisable.



  • 1x TSN-99A body
  • 1x TE-11WZ II 30-70x Zoom eyepiece
  • 1x Objective lens cap
  • 1x Eyepiece cap

This product has a limited stock.

Price incl. VAT: € 4.198,00

Article number:Help440991
Diameter Objective:Help99 mm
Filter Thread:Help105 mm
Lens type:HelpFluorite
Use:HelpTravel, Hunting, Birdwatching, Plane spotting, Astronomy
Exit pupil:Help3.3 mm (30x) ~ 1.4mm (70x)
Lenscoating:HelpFully Multi Coated
Glass material:HelpBaK-4
Length:Help37.8 cm
Weight:Help1810 g
Warranty:Help10 years
Brightness:Help10.9 (30x) ~ 2.0 (70x)
Twilight Factor:Help51.4 (30x) ~ 78.6 (70x)
Field of view at 1000m:Help35 m (30x) ~ 20 m (70x)
Focusing:HelpCourse- and fine tuning
Close focus distance:Help6 meters
Attachment:PDF bestandDownload testrapport twents vogelwerkgroep
Attachment 2:PDF bestandDownload review dutchbirding

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.