Kowa Pure Fluorite Crystal Flagship Model with a Large 88mm Diameter Lens
In 2008 the Cornell Ornithology Lab conducted ScopeQuest , a detailed comparison test of 36 spotting scopes. Optics (ranging in price from $220.00 to $4500.00) were viewed side-by-side and rated according to sharpness, color fidelity, edge-to-edge focus, brightness, distortion, and general optical quality. The testing team also considered ease of handling/focus, and eye relief (scopes with longer eye relief are better for eyeglass wearers). Two of the finest spotting scopes AccurateShooter.com has used, the Zeiss Diascope 85 T FL, and the Swarovski APS 80 HD, performed very well as expected, and ended up near the top of the list. The TeleVue-85 APO , a very large refractor, received the highest ratings for image quality (both at 20X and 60X), but lost points for easy of use and general “feel”. The overall winner among the 36 spotting scopes tested was the Kowa TSN-883 Prominar , a new-generation spotter with a huge 88mm objective, dual focusing knobs, and spectacular flourite glass. The results of Cornell’s spotting scope test are found on the LivingBird.org website. Click the link below for a charrt ranking all 36 scopes according to their overall ratngs.
Spotting scope Test Summary For birders willing to take the plunge for the very best optics at whatever cost, the top choices, in my view, are either the Kowa 883/884 or 773/774 or the Swarovski HD 80mm or 65mm scopes. Any of these top scopes will give you years of pure birding pleasure. Ken Rosenberg is director of Conservation Science at the Lab.
Kowa Pure Fluorite Crystal Flagship Model with a Large 88mm Diameter Lens
The flagship of Kowa spotting scopes with an extremely large 88mm objective lens. The enthusiasm behind Kowa’s 60 years of spotting scope development is manifested in this supreme model. Its optical performance and user friendliness leaves a satisfying impression on the user.
88MM FLUORITE CRYSTAL LENS
"PROMINAR" Lens One of the major causes of deterioration of viewing quality in
optics is chromatic aberration (color blur). Chromatic aberration
occurs due to the dispersion of light and the different wavelengths of
light focusing on different positions, resulting in a red or purple
fringing around the image. The optimum optical material to minimize
chromatic aberration is fluorite crystal.
This technology is the result of many years of optical design and has
realized great reduction in chromatic aberration, while maintaining a
large diameter lens and high contrast images when compared with
conventional models.
The XD lens used in our TSN-773/774 PROMINAR models has characteristics
similar to those of fluorite crystal to significantly reduce the
chromatic aberration. All lenses are environmentally friendly Eco-Glass.
(Eco-Glass is an environmentally friendly glass that does not contain
lead or other harmful substances.)
LARGE LENS, COMPACT SIZE
MAGNESIUM ALLOY BODY
DUAL FOCUS MECHANISM (QUICK & FINE FOCUSING)
EYEPIECE LOCKING MECHANISM
TRIPOD MOUNT
WATERPROOF & FILLED WITH DRY NITROGEN GAS
SPECIFICATION:
Model
TSN-883 / Angled
Objective Lens Diameter
88mm
Lens Type
Fluorite Crystal Lens
Minimum Focusing Distance
5m (16.4feet)
Length
343mm (13.5in)
Weight
1520g (53.6oz)
Filter Diameter*
95mm
*Filter can be attached to scope.
In the Box
Kowa TSN-884 Straight 88mm Prominar Spotting Scope (Eyepiece TE-11WZ)
Push-On Objective Cap Rear Scope Cap (covers eyepiece connection end ) Limited Lifetime Warranty
Suggeated Eyepieces:
Model
TE-10Z (Discontinued)
TE-17W
TE-20H
TE-11WZ
Magnification
20~60X
30X,Wide
25X,LER
25-60
Real Field of View
2.2*~1.1*
2.4*
2.1*
2.4*-1.32*
Exit Pupil
4.4~1.5mm
2.9mm
3.5mm
3.5-1.5
Relative Brightness
19.4~2.3
8.4
12.3
12.4-2.2
Twilight Factor
42.0~72.7
51.4
46.9
46.9-72.7
Eye Relief
17.0~16.5mm
20.0mm
32.0mm
17mm
Field of view at 1000m/yds
38.4~19.3m/yds
41.9m/yds
36.7m/yds
42-23m
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