Explore Scientific 3" Field Flattener & .7X Focal Reducer - FFFR507X-00

 Explore Scientific’s 3” Field Flattener .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.

When you attach the Explore FFFR507X-00 to your Explore 127 or 152 refractor telescope, it will improve the flatness of the field & reduce the telescope's effective focal ratio by .7X. A flat field translates to sharper, more pinpoint stars out to the furthest reaches of the field of view, and reducing the focal length creates a wider field of view and, when imaging, allows for shorter exposure times. The back focus is 55 mm as measured from the rear flange.

The Explore Scientific 3” Field Flattener & .7X Focal Reducer is fully multi-coated for a high level of clarity and brightness, and comes with a M42x0.75 adapter to help you attach your DSLR or CCD camera. If attaching a DSLR, please note that you will still need a T-ring for your camera brand. The extra photo at left shows all of the components…the focal reducer/field flattener body, a 3” nosepiece, and the M42 adapter.

• Diameter: 78.3 mm
• Weight: 1.4 lb.
• Height: 90.1 mm
• Back Focus: 55 mm from rear flange
• Thickness of M42 Adapter: 6.25 mm

• 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 our 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.

  While technically this was designed for the F/8 system, through user experiences and our subsequent testing we have concluded that our 3" Flattener / Reducer performs very well with our F/7.5 refractors.