Kowa - TSN-664M 66mm PROMINAR XD Spotting Scope (Straight Viewing, Green)

A Guide to Birding with Spotting Scopes

The green, straight-viewing TSN-664M 66mm PROMINAR XD Spotting Scope from Kowa features high-quality optics built into a body that is designed for reliable use under a variety of viewing conditions. Measuring 12.3" long and constructed from magnesium alloy, this durable scope can provide a wide angle or a versatile viewing range depending on which separately available eyepiece is installed on it.

Compatible Kowa eyepieces include the TE-14WD 30x Wide-Angle Eyepiece, the TE-17HD 25x Long Eye Relief Eyepiece, and the TE-9Z 20-60x Zoom Eyepiece.

While in use, the TSN-664M 66mm Spotting Scope's PROMINAR XD (extra-low dispersion) lens and a concave dispersion lens work together to minimize chromatic aberrations. Additionally, multi-coated optical surfaces help to consistently maximize light transmission, sharpness, and color fidelity.

A nitrogen fill prevents fog accumulation and an O-ring sealed waterproof construction further adds to the rugged design of the TSN-664M 66mm Spotting Scope. Conforming to JIS (Japanese Industrial Standard) Protection Class 7 waterproofing, this scope can withstand momentary immersion, assuming the eyepiece mount is not open and exposed.

Optical Performance

66mm objective lens

PROMINAR XD lens and a dispersion concave lens help to minimize chromatic aberrations

Multi-coated optical surfaces minimize reflections while helping to maximize light transmission, sharpness, and color fidelity

Use and Handling

Smooth and coarse focus knobs

Integrated sunshade

Rotatable tripod collar with 1/4"-20 threading

Construction Details

Magnesium-alloy body

Nitrogen filled to be fogproof

O-ring sealed to be waterproof