Explore Scientific 3in Field Flattener .7x Focal Reducer for ED APO 152mm F/8

Explore Scientific 3in Field Flattener .7x Focal Reducer for ED APO 152mm F/8. 7x Focal Reducer for ED APO 152mm F/8 to reduce the curvature when acquiring various images. The Explore Scientific 3in ED APO 152mm F/8 Field Flattener w/ .7x Focal Reducer reduces your f-ratio by .7 which results in a wider field of view brighter images and less exposure time. The Explore Scientific 3" ED APO 152mm F/8 Field Flattener w/ .7x Focal Reducer can tackle the edge-of-field aberrations caused by necessary curvature to ensure your night at the eyepiece will result in crisp true images. Specifications for Explore Scientific 3in ED APO 152mm F/8 Field Flattener w/ .7x Focal Reducer: Weight: 1.4lb; .64kg Diameter: 78.3mm Height: 90.1mm Package Contents: Explore Scientific 3in Field Flattener w/ .7x Focal Reducer for ED APO 152mm F/8 Field Flattner and .7X Focal Reducer (for ED127-152-165 Air-Spaced Triplets); 3.0-inch O.D. with Adapters for Explore Scientific Focusers