Kowa TE-80XW Extreme Wide Angle Eyepiece - 40x Magnification

The main advantage is its extremely wide 80-degree field of view, which provides an immersive experience and makes it easier to find and track subjects.

It provides 40x fixed magnification when used with the Kowa TSN-99 PROMINAR SERIES spotting scopes and 35x fixed magnification with the TSN-880/770 PROMINAR SERIES spotting scopes.

Yes, it features 17.0mm of eye relief, which is generally sufficient for comfortable viewing with eyeglasses.

No, it is specifically designed for use with Kowa PROMINAR spotting scope models: TSN-99, TSN-880, and TSN-770 series.

Use a soft lens brush to remove loose dust. For smudges, use a dedicated lens cleaning cloth or a microfiber cloth lightly dampened with lens cleaning solution. Always clean gently from the center outwards.

A field flattener lens corrects optical aberrations so that the entire image, from the center to the edges, remains sharp and in focus, preventing a 'curvy' or distorted view at the periphery.

This eyepiece is made in Japan.

Ensure you are using a compatible Kowa PROMINAR spotting scope series (TSN-99, TSN-880/770). Check that the scope's eyepiece locking collar is fully loosened before insertion and tightened properly afterward.

Adjust the focus knob on your spotting scope. Ensure the eyepiece is fully seated and locked in place. Clean the eyepiece lenses if they are dirty.

Ensure the sunshade or objective lens hood of your spotting scope is extended. Avoid pointing the scope directly at the sun or very bright light sources unless observing celestial bodies.

Confirm the eyepiece is correctly identified for your scope model (40x for 99 series, 35x for 880/770 series). The specified field of view is a measurement at 1000m; actual perceived field can vary slightly with atmospheric conditions.