Explore Scientific’s 3” Field Flattener .7x Focal Reducer addresses the edge-of-field aberrations caused by curved focal planes. They optimize the photographing capabilities of fast refractor telescopes.
As a focal reducer, this device will reduce your f-ratio by .7, which results in a wider field of view, brighter images and less exposure time. Recommended for Explore Scientific 127mm and 152mm refracting telescopes, this field flattener/focal reducer boasts fully multi-coated optics and comes with 2 adapters to accommodate different focuser sizes.
Explore Scientific designed the piece for their F/8 system, but through user experiences and subsequent testing they have concluded that the 3" Flattener / Reducer performs very well with their F/7.5 refractors also.
Includes 2" adapter to attach directly to threads of a new style Explore Scientific focuser draw tube. It also can connect to your camera.