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August 2nd, 2021

Kowa Introduces 99mm Objective Prominar Spotting Scope

Kowa TSN-99A TSN-99 99mm Spotting Scope Prominar new

Kowa TSN-99A TSN-99 99mm Spotting Scope Prominar newBigger is normally better — when it comes to light transmission and field of view. Kowa has introduced an all-new, high-end spotting scope, the TSN-99 Prominar, which has a huge 99mm front objective lens. This 99mm spotting scope features a pure Fluorite XD (eXtra-low Dispersion) lens for maximum light transmission, with superior edge-to-edge sharpness, and minimal chromatic aberration.

The TSN-99’s primary TE-11WZ II eyepiece provides a 30-70X range of magnification and there is also a 40X extreme-wide-angle eyepiece. That would be very effective for wind-reading. Existing accessories for Kowa’s 88/77 series are compatible with the new TSN-99 series spotters.

Who needs a spotter this big? We expect this will be popular with wind coaches and shooters involved in the ELR game. And guys who started with a 60mm, then graduated to an 80mm or 88mm, may decide to step up to this big new optic. It will certainly offer better low-light performance. That 99mm objective equals 3.898 inches.

With a 100% magnesium alloy structure, this big spotter is lighter than you might expect. The angled model weighs 3.99 lbs. (1810 grams) while the straight version weighs 4.04 lbs. (1835 grams). With the magnesium body, Kowa claims the TSN-99 series is “one of the most compact and lightweight in its class … making it more portable than many other models.” The objective lens boasts a protective Kowa KR coating which actively repels dirt, moisture and dust.

Kowa TSN-99A TSN-99 99mm Spotting Scope Prominar new
Kowa TSN-99A TSN-99 99mm Spotting Scope Prominar new

Avaliable accessories include: TE-11WZ II 30-70X wide zoom eyepiece, TE-80XW 40X extreme-wide-angle eyepiece, TSN-EX16 1.6x extender, plus Digiscoping adapters.

The TSN-99 PROMINAR spotting scopes will be available for pre-order starting August 2, 2021, with product distribution beginning on September 9, 2021.* Click HERE for product information.

PRICING — $3999.00 with 30-70X Eyepiece or $3250.00 Body Only
Current actual retail price now at EuroOptic.com for the Angled TSN-99A is $3999.00 with TE-11WZ II 30-70x Zoom Eyepiece or $3250.00 for TSN-99A body only. Likewise the Straight TSN-99S with 30-70X eyepiece is $3999.00, or $3250.00 for TSH-99S body only.

For our European readers, the Kowa Website lists the prices for TSN-99A Angled OR TSN-99S Straight spotters as follows: €3,899.00 with 30-70X eyepiece, or €3,199.00 body only. (I.e. same price for either straight or angled, VAT included).

Kowa TSN-99A TSN-99 99mm Spotting Scope Prominar new

Kowa’s 88mm TSN-880 Prominar spotters have finished at the top of many spotting scope comparison tests, so we expect the new 99mm TSN-99 to raise the bar even higher. Kowa explains: “The TSN-99 Prominar Series is the evolution of over six decades of Japanese optical design and technology. It utilizes the very best from our optical heritage and benefits from features, technology, and engineering developed by generations of Kowa optical experts.”

Kowa states that the TSN-99 Prominar Spotter was created to deliver “the brightest and widest view of nature[.] We created TSN-99 PROMINAR series because we wanted to deliver one of the most immersive and detailed views of the natural world.”

This short 1.5-minute video shows the TSN-99 used in the field:

This 7.5-minute video provides details of the TSN-99’s design, lens properties, and controls:

TE-80XW Extreme-Wide-Angle 40X EyePiece: 37M at 1000M
Along with a 30-70X zoom eyepiece, Kowa offers the Kowa TE-80XW eyepiece for the TSN-99 spotter series. The TE-80XW offers an 80-degree view, one of the widest field of views ever offered with similar magnification. This provides a view of 37 meters (40.5 yards) width at 1000m distance. That would allow you to see a very long line of targets or wide spread of wind flags with 40X magnification.

The TE-80XW incorporates a field-flattener lens maintaining flat resolution throughout the entire 80-degree field of view. The Kowa TE-80XW is 100% waterproof, sealed against the elements, and protected against dirt, moisture and dust by Kowa’s unique KR coating.


*The September 9, 2021 date was in Kowa’s official press release. However, Kowa’s global website states: “The new TSN-99 PROMINAR spotting scope series… will be available to purchase from Kowa authorised dealers from the 1st October 2021 [sic].” Thanks to EdLongRange for finding TSN-99 Series current pricing.
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June 8th, 2011

Optics Review: Kowa TSN-884 Prominar (PFC) Spotting Scope

Kowa TSN-884 Spotting Scope Review
by Danny Reever
It has been a couple of years since I wrote the review of high-end spotting scopes for AccurateShooter.com. In that time there have been some advances in technology and unfortunately some hefty price hikes to go along with that technology. Not too long ago, few top-end scopes exceeded $2300.00 with eyepiece. Now some premium spotting scopes top the $4000.00 mark with eyepiece! My Pentax PF100-ED, once a top-of-the-line product (but now discontinued by Pentax) would now be considered a mid-price spotting scope, given the current pricing of premium spotting scopes from Kowa, Leica, Zeiss, Swarovski and other top brands. “Street Price” for the Kowa TSN-884 reviewed here, is roughly $2800.00 with eyepiece. That’s a serious investment by any standards.

“The Kowa Prominar (TSN 88X series) is quite simply the best spotting scope I’ve ever looked through. In all instances the Kowa out-performed everything I was able to compare it to. The Kowa had unrivaled clarity, and I could resolve 6mm bullet holes at 500m with it better than with my 100mm Pentax. After testing the Kowa, I sold my Pentax PF100-ED, and I’m planning to purchase a Kowa TSN-884.”

kowa Prominar 883 884 scopeBeing like many shooters out there I’m always looking for that better mousetrap in regard to seeing 6mm bullet holes at extended yardages. That’s how I ended up with the Pentax PF100-ED. Recently I had been hearing rumblings here and there from other shooters and on various websites raving about the Kowa TSN 883/884 spotting scopes. In fact right here on AccurateShooter.com’s Daily Bulletin it was reported that the Kowa Prominar was rated number one by the Cornell Ornithology lab in their 2008 Scope Quest — a detailed review of 36 spotting scopes. However, they did not compare all spotting scopes that were available at that time. The super expensive Leica 82mm Televid APO HD was missing, along with my Pentax PF100-ED. The Cornell test also was geared more toward birders than shooters, but it was enough to pique my interest in regard to the Kowa, which features an 88mm objective with Pure Flourite Crystal (PFC) main lens elements.

I had to find a Kowa 883/884 to review and compare to what shooters were currently using out there. I contacted Kowa USA, which graciously agreed to furnish me one to review for Accurate Shooter. I requested the Kowa TSN-884 straight body along with the 20-60X zoom eyepiece that Kowa had redesigned for the 77-88mm spotting scopes. I chose the straight body over the TSN-883 angled version. With a straight spotter you can easily monitor flags and conditions downrange without moving your head very much. I admit the TSN-883 angled model may be more user-friendly for some applications, such as prone and F-Class shooting. With an angled body you can also set the scope slightly lower on your tripod. Straight or Angled — you need to choose what works best for you in your particular application.

kowa Prominar 883 884 scope

Kowa TSN-884 Highlights
Even though the Kowa has a large 88mm objective I was struck by the compactness of this scope. With a length of a little over thirteen inches without eyepiece it is compact indeed. Weight (without eyepiece) is a trim 53.6 ounces due to the use of Magnesium alloy for the scope body. With the 20-60X eyepiece installed, length is 16 3/8 inches, and weight is 65.1 ounces. Compare this to my monster-sized Pentax PF100-ED which is 23 ¾ inches long and weighs 111.1 ounces (6.94 pounds!) with eyepiece. The Kowa is 7 3/8″ shorter overall, and the Kowa is an amazing three and a half pounds (56 ounces) lighter in weight! The smaller size and weight of the Kowa allows you to use a much lighter and more compact tripod for this scope if you so desire. (Note: You might think the Pentax’s weight might actually stabilize the unit. However, the problem is that much of the weight of the Pentax is way out front, where it is cantilevered far forward of the mounting bracket. We’ve found that just a light touch on the front end of the Pentax will cause it to shake and wobble. Because so much weight is cantilevered way out front, the Pentax can wobble easily even on a massive tripod.)

kowa Prominar 883 884 scope

The most impressive quality of the Kowa 883/884 is its bright, ultra-sharp image. This super-sharp, distortion-free image comes from superior glass. The objective lens of the TSN 884 incorporates Pure Fluorite Crystal (PFC). Kowa claims 99% or higher light transmission and after looking through the scope I have no reason to doubt that claim. One focuses the Kowa via a system of two focus controls along one axis. The larger-diameter knob provides course adjustment to rapidly bring the subject into focus. The smaller-diameter control fine-tunes the focus for the sharpest image. This system works well in practice and one adapts quickly to the dual controls.

Like most high-end spotting scopes, the Kowa 883/884 is designed to function in all weather conditions. The nitrogen-purged body is fully sealed, and Kowa claims the “housing” is waterproof — but no you don’t want to dunk your scope in a river. Note: Even though this scope is robustly constructed, I must point out that the Kowa does not have any rubber armor coating. This does keep the weight down, but if you are tough on scopes, you may prefer a different design, such as the new Zeiss Diascope which boasts full rubber armor over the entire scope body. Kowa does offer a padded cover for an additional $125.00 which would help protect the scope. Given the high cost of the TSN 883/884, the padded cover is probably a smart investment.

Kowa TSN-884 Field Test Results
Initially I set up the Kowa and my Pentax PF100-ED on separate tripods side by side on my front deck. I was immediately impressed with the optical clarity of the Kowa, especially at the lower powers. I aimed both scopes at my neighbor’s log house, perhaps 150 yards away, focusing on a particular log end cut. With both scopes set at 60-power I could easily count the growth rings on the log with both scopes. However, the Kowa, without question, was clearer. How much clearer? I can best describe it this way. Imagine looking through a car window with the window up. Now imagine rolling the window down and looking again. With the Kowa, it was like having the window rolled down — contrast was a bit better, colors were a bit more vibrant, things seemed slightly sharper — as if a thin haze had been removed.

Using the Kowa TSN-884 at the Range
I have taken the Kowa to the range on numerous occasions over the past few weeks. I’ve used it in many different environmental conditions, comparing it to as many different spotting scopes as were available. In all instances the Kowa out-performed everything I was able to compare it to. Sometimes (but not always) the difference was startling.

kowa Prominar 883 884 scope

One of my tests included a Snellen Eye Chart, just like the one at your optometrist office. Instead of it hanging on a wall, I placed the Snellen Chart at 500 meters along with some previously-shot paper Ground Hog targets. Conditions were hazy and humid with moderate mirage. My Nightforce 12-42x56mm Benchrest riflescope set at 42X could read line 6 on the chart and I could distinguish only a few of the 6mm bullet holes. My Pentax PF100-ED set at 60X (to match the Kowa’s maximum power) was better. With the Pentax I could read line 7 on the chart and see more of the bullet holes. With the Kowa set at 60X, I could read line 8 on the chart and see all of the bullet holes on the white parts of the targets.. FYI, line 8 on the Snellen Chart defines 20-20 vision at 20 feet. Reading that at 500 meters (1641 feet) is pretty impressive!

I could make out perhaps one-third of the bullet holes in the black parts of the targets with the Kowa. That’s not that great, but the Kowa did better than the Pentax or the Nightforce. Rodney Smith, another Shippensburg shooter, had his own Pentax PF100-ED on site. Comparing his PF100-ED with the Kowa, Rodney agreed that the Kowa TSN-884 was markedly better. (It is interesting to note that both Rodney’s Pentax and mine were optically identical in every respect when compared side by side. And the Kowa out-performed them both.) Another shooter, Bob Chamberlin, had the smaller Pentax PF80-ED on site so we could compare the smaller Pentax with the Kowa as well.

kowa Prominar 883 884 scope

Since then I’ve tested the Kowa in some really severe mirage. When the mirage is really running it’s a hard test for any optic. When the mirage is building, I’ll say that the Kowa can perhaps give you a longer timespan or “viewing window” — starting when you start to lose sight of 6mm bullet holes until you lose them all together. How much is the “viewing window” extended? That depends on the environmental conditions, your eyesight, and your age. My son Logan, who is fourteen with eyes like a hawk, can see 22/6mm bullet holes when I can’t see a thing. Youth and 20/20 vision trumps old eyes every time.

Kowa TSN-884 Performs Great in Ground Hog Match
I used the Kowa at the Shippensburg, Pennsylvania Ground Hog Match on May 28, 2011. At that match, I managed to set a new course record for the 200/300/500 meter distance. Here’s the important fact — using the Kowa I could easily see my 6mm bullet holes at all yardages. That sure helped my shooting and contributed to setting the course record. But then, “Even a blind squirrel finds a nut now and then.”

Overall Assessment — Superior Performance, and a Hefty Price
The Kowa is a truly outstanding spotting scope. I’ll go on record and say it’s the best I’ve ever looked through. However, this level of optical performance does come with a hefty cost — “street price” is about $2800.00 with eyepiece. Is the Kowa TSN-883/884 worth almost $1000 more than a Pentax PF100-ED (if you can find one)? Is the Kowa worth $1700.00 more than the excellent Pentax PF80-ED (a ‘best buy’) which costs around $1100.00 with 20-60 zoom eyepiece? Only you can decide that.

In my situation, I decided that the Kowa was worth the price. After testing the Kowa TSN-884 and using it successfully at a match, I decided to purchase one. I have sold my Pentax PF100-ED, and I’m shopping right now for a Kowa TSN-884. So far, the best price I’ve found is on Amazon.com — $2100.00 for the TSN-884 body only.

Three Eyepiece Options Available
Kowa offers three new eyepieces designed for its 77-88mm family of scopes: a 25X long eye relief; a 30X wide angle; and a 20-60X zoom. These current eyepieces are held securely within the body by means of a locking button on the scope body that needs to be pressed while un-mounting an eyepiece, so accidental removal is prevented. (Older Kowa eyepieces may be used with the purchase of an adapter for those upgrading their scope bodies.) The new generation 20-60X zoom eyepiece will be of most interest to shooters. This has a field of view (at 1000 yards) of 115 feet at 20 power and 55 feet at 60 power. Minimum eye relief is 16.5mm — that’s pretty good for a spotter with 60X magnification. Exit pupil size ranges from 4.4mm to 1.5mm. The shortest distance at which the TSN-884 can focus is 16.5 feet — so, yes, you can use this for handgun spotting duties.

The eyepiece features a twist-up eyecup with four detents. One possible annoyance is the eyecup can come unscrewed when you are trying to adjust it due to the fact that the digiscoping adaptor is designed to fit in the place occupied by the eyecup. I didn’t really find this a problem but it is worth mentioning in cases where multiple users are constantly adjusting the eyecup. If I had to suggest anything to Kowa to make the TSN-884 better it would be to increase the magnification to 75X for those times when you could use the extra power. Rumor has it that Kowa just might have a higher 70- or 75-power eyepiece on the drawing board. That would make the TSN-883/884 an even more impressive product.

Disclosure: Kowa provided Danny Reever with a temporary “loaner” TSN-884 (with eyepiece) for testing and evaluation. Kowa provided no compensation to the reviewer.
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