Description
KOWA TSN-88A PROMINAR 25-60xW zoom observation telescope (SKU: 121059 / 12358 TSN-88A KIT)
The Kowa TSN-88A Prominar 25-60x telescope with a TE-11WZ II zoom eyepiece is a professional set designed for the most demanding users. Thanks to the use of the best materials currently available, this product is characterized by unique image quality and very high durability.
This telescope uses the highest quality low-dispersion optical system with a fluorite lens. Fluorite, occurring naturally near hydrothermal veins and in igneous rocks, is characterized by an extremely low refractive index (n = 1.4), unattainable even for the best types of optical glass. This unique feature of fluorite means that lenses made of it allow you to obtain an image almost free of chromatic aberration, ensuring perfect color reproduction and excellent contrast. The material used to produce the Kowa TSN-88A Prominar scope is synthetic fluorite, which, unlike a naturally occurring mineral, is free from contamination with rare earth metals, which give a greenish or purple color. The disadvantage of fluorite compared to optical glass is that it is extremely difficult to process. Calcium fluoride single crystals tend to chip, so over the years Kowa has had to develop a unique technology for grinding and polishing lenses made of this material, which has resulted in the production of optical instruments that are unrivaled in terms of image quality.
To further improve image quality, the fluorite lenses have been covered with a full, multi-layer anti-reflective coating, resulting in a sharp and clear image even in unfavorable lighting conditions. The entire structure is enclosed in a sealed and nitrogen-filled housing, which means that the equipment is not afraid of difficult weather conditions, such as rain, snow or low temperatures.
The most important features of the Kowa TSN-88A Prominar 25-60x riflescope
• optical system with a low-dispersion lens made of pure fluorite and fully covered with anti-reflective coatings
• external lenses additionally covered with a dirt- and scratch-resistant KR™ coating developed by Kowa
• wide-angle TE-11WZ II eyepiece placed at an angle, making it easier to observe objects high above the horizon
• dual focusing mechanism for coarse and fine adjustments
Technical parameters
• design: angular telescope
• magnification: 25 – 60x
• lens diameter: 88 mm
• filter thread diameter: 95 mm
• low dispersion lens material: crystalline fluorite
• optical system coating: full anti-reflective multi-layer coating, Kowa KR™ oleophobic coating
• prism design: porro-prismatic
• field of view: 42 – 23 m @ 1000 m
• exit pupil relief: 17 mm
• exit pupil: 3.5 – 1.5 mm
• minimum observation distance: 5 m
• relative brightness: 12.3 – 2.3
• twilight efficiency: 46.9 – 72.7
• focusing mechanism: double (coarse / fine)
• inert gas filling: yes, nitrogen
• waterproof: yes
• body material: magnesium
• eyepiece: replaceable, TE-11WZ II (included)
• tripod thread: yes, double
• length: 342 mm
• set weight: 1840 g
Set elements
• luneta Kowa TSN-88A Prominar 25-60x
• TE-11WZ II zoom eyepiece
• lens cap
• optics cleaning cloth
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