3" Field Flattener .7x Focal Reducer 15-3mm-eye-relief The National Geographic Expedition Series

The National Geographic Expedition Series 10x42 WP Binoculars are the ideal companion for outdoor enthusiasts seeking durability and superior optical performance

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Color Filter #ND96 Moon Filter (0

5" Hex focuser

Unlock the night sky with ease using the National Geographic 70mm Automatic Telescope

3" Field Flattener .7x Focal Reducer 15-3mm-eye-relief The National Geographic Expedition SeriesExplore Scientifics 3 inch Field Flattener 0. 7x Focal Reducer is a multi faceted accessory designed to enhance your astrophotography experiences. As a field flattener, this piece addresses the edge of field aberrations caused by curved focal planes to ensure your night at the eyepiece will result in crisp, true images. As a focal reducer, this device will reduce your f ratio by 0. 7, which results in a wider field of view, brighter images and less