Explore Scientific 0.8x Focal Reducer

Explore Scientific 0.8x Focal ReducerThe Explore Scientific 0. 8x Focal Reducer converts compatible ES refractors into faster, wider field astrographs for astrophotography. By reducing the effective focal length by 0. 8x, it widens your field of view and speeds up your f ratio an 80mm f 6 becomes f 4. 8, a 102mm f 7 becomes f 5. 6. Shorter exposures, wider framing, and the same sharp optics your telescope was designed to deliver. The 2 element design threads directly into a standard M42

The Explore Scientific 0.8x Focal Reducer converts compatible ES refractors into faster, wider-field astrographs for astrophotography. By reducing the effective focal length by 0.8x, it widens your field of view and speeds up your f/ratio — an 80mm f/6 becomes f/4.8, a 102mm f/7 becomes f/5.6. Shorter exposures, wider framing, and the same sharp optics your telescope was designed to deliver.

The 2-element design threads directly into a standard M42 T-ring (sold separately) for DSLR, mirrorless, and dedicated astronomy cameras. Back-focus distance is 55mm — the same standard used across all Explore Scientific correctors and reducers, so spacing setups are consistent and interchangeable.

Key Features

• 0.8x focal reduction — faster f/ratio for shorter exposures and wider fields
• 2" barrel slides directly into any 2" focuser
• M42x0.75 (T-thread) camera interface
• 55mm back-focus standard — consistent with the ES corrector/reducer ecosystem
• 2-element optical design

Compatible Telescopes

• ES Essential Series: ED80, ED102
• ES FCD100 Series: 80mm, 102mm, 102mm Carbon Fiber

This is a dedicated reducer for Explore Scientific f/5 to f/7 refractors — not a universal focal reducer.