KOWA SPOTTINGSCOPE TSN-99S PROMINAR STRAIGHT 12183 TSN-99S

The Kowa Spotting Scope TSN-99S Prominar is the new flagship of Kowa. The TSN-99S 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-99S is equipped with a dual focus mechanism, the image can be focused fast and more accurately in just a few smooth revolutions with just an index finger. The fine focus mechanism provides the final control to view the image razor sharp.

Because the Kowa TSN-99S uses a 100% magnesium alloy, it is a compact and lightweight spotting scope in its class. The TSN-99S 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.

"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-99S 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-99S with the right accessories:

(The accessories listed can be ordered via optional accessories)

Eyepieces

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-99S with the corresponding specifications:

SPECIFICATIONS IN COMBINATION WITH KOWA TSN-99S

	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

Astro Adapters

With the use of a Kowa Astronomy adapter, the TSN-99S can also be used for night-time celestial observation and photography. For this purpose a universal 1.25" astro eyepiece can be used.

Digiscoping Adapter

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-99S, you can choose to complete it with the accessories listed below:

• Kowa C-992 water-repellent Stay-On Bag
  The water-repellent bag has been specially designed for the Kowa TSN-99S 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-99S 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.