What is the main advantage of the 99mm pure fluorite crystal objective on the Kowa TSN-99S?
The 99mm pure fluorite crystal objective, paired with a Kowa XD concave lens, provides two key advantages: superior low-light performance (dawn/dusk) and the virtual elimination of chromatic aberration (color fringing), even at high magnification. This results in sharp views with accurate color.
What is the difference between the Kowa TSN-99S (straight) and TSN-99A (angled) models?
The TSN-99S is the straight viewing version and the TSN-99A the angled viewing version of the TSN-99 PROMINAR. They share the 99mm pure fluorite crystal objective, the dual focus system and the 105mm filter thread. The straight TSN-99S body measures 365 mm (14.3 in) and weighs 1835 g (4.04 lb).
How does the dual focus system on the TSN-99S work?
The dual focus system uses a two-step knob. The quick focus brings the object into focus 3 times faster than the fine focus, moving from the 6m minimum focus to infinity in only two revolutions. The fine focus provides slight, precise adjustments for critical sharpness, which is essential for digiscoping or resolving fine detail at high power.
Can I use filters with the Kowa TSN-99S?
Yes. The TSN-99S has a 105mm filter thread on the front of its objective lens housing, and the manual notes that various types of filters can be attached. Kowa's own TP-105FT 105mm Objective Lens Filter features KR coating and helps protect the objective lens.
How does the Kowa TSN-99S perform for observing wildlife at dusk?
The TSN-99S is built for low light. Its 99mm pure fluorite crystal objective paired with a Kowa XD concave lens produces superior low-light performance and exquisite detail, and the large aperture gathers more light than a smaller objective, producing a brighter image as daylight fades.
What is the minimum focusing distance of the Kowa TSN-99S ZM SET?
The minimum focusing distance for the TSN-99S is 6 meters (19.7 feet). This allows you to observe subjects that are relatively close, such as birds in nearby trees.
How do I attach a camera for digiscoping with the TSN-99S?
The TSN-99S has an accessory collar on the scope body. You must first remove the eyepiece, then unscrew the protective ring from the collar (counter-clockwise). This exposes threads for the direct attachment of Kowa digiscoping accessories (sold separately). Kowa describes this set as ideal for digiscoping with a camera or smartphone.
Is the Kowa TSN-99S waterproof?
Kowa does not state a waterproof rating for the TSN-99S. Kowa says the TSN-99 PROMINAR series is built to last a lifetime and can be used with confidence even in the harshest of environments, and the KR coating on the objective lens actively repels moisture, dirt, and dust.
What other eyepieces can I use with the TSN-99S body?
Besides the included TE-11WZ II zoom, Kowa lists the TE-80XW Extreme Wide Angle eyepiece (40x on the TSN-99) and the TE-20H Long Eye Relief eyepiece for the TSN-99 body.
How should I clean the pure fluorite crystal lens on my Kowa TSN-99S?
First, use a blower, compressed air or a soft hairbrush to remove dust or other substances. Then gently clean the lens with a light circular motion using an optics cleaning cloth, gauze or cleaning paper. Commercial lens cleaners can leave a film on the lens surface, so use only the smallest possible amounts.
Does the Kowa Limited Lifetime Warranty cover accidental drops?
The Kowa Limited Lifetime Warranty covers defects in materials and workmanship, not accidental damage. The warranty is void if damage results from unauthorized repair, alteration, abuse, or misuse, and it does not cover normal wear and tear.
