The Kowa TSE-Z9B 20-60x Zoom Eyepiece for Kowa TSN-600 and TSN-660 series Spotting Scopes is one of the optional eyepieces designed to be used with your Kowa TSN-601, 602, 603 or 604 spotting scope, as well as Kowa TSN-661, 662, 663, or 664 spotting scope. Kowa's TSN-600 and TSN-660 series spotting scopes do not come with an eyepiece, and require an optional eyepieces for their operation. Fully multi-coated optics provide a clear view, sharp image, and less distortion, while longer eye-relief than current eyepiece models allows eyeglass wearers to easily see the entire image. This unit has twist-up eyecups that can be set at different heights, allowing you to find the ideal viewing position, and that can be removed for use with digital cameras or for cleaning. The TSE-Z9B is a 20x to 60x magnification zoom eyepiece that provides you with a field of view ranging from 109 feet to 80 feet at 1,000 yards. This unit is easy to install, requiring you to simply push in the eyepiece, and then pull it out again for detachment. The TSN-Z9B features a real field of view of 1.9 to 1.4 degrees, an apparent field of view of 38 to 56 degrees, and a relative brightness ranging from 10.9 to 2.3. This interchangeable eyepiece has an exit pupil diameter ranging from 3.3 to 1.5 millimeters, with an eye relief of 18.5 to 15 millimeters.
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