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

Die cast aluminum spreader tray locks against the inside of the legs for added stability and to keep vibrations to a minimum

Cable Length: 7

as you move the detector over the metal

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