Celestron 0.7x focal reducer for Celestron 8" EdgeHD scopes and optical tubes | Astronomics.com
Agena's Guide to Focal Reducers
Explore Scientific 3" Field Flattener .7x Focal Reducer - FFFR507X-00
TS Optics 0.5X focal reducer with 2” filter thread
Amazon.com : Astromania 0.5X Reducer for Photography and Observing - 1.25" Filter Thread (28.5x0.75MM) on Both Sides - Reduces The Focal Length for Visual and Photographic Use : Electronics
Agena's Guide to Focal Reducers
Viltrox M43 Lens Adapter Focal Reducer Speed Booster Turbo Aperture 0.71x For Nikon Lens To M4/3 Camera Panasonic Olympus - Lens Adapter - AliExpress