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Amazon.com : SVBONY Reducer for Telescope 0.5X Focal Reducer 1.25 inches Fully Multi Coated Reducer for Telescope Eyepiece Photography and Observing (Reducer) : Electronics
Bresser UK | EXPLORE SCIENTIFIC 3" 0.7x Reducer/corrector | Call 01342 837 098 for advice and sales.
Agena's Guide to Focal Reducers
Amazon.com : SVBONY Reducer for Telescope 0.5X Focal Reducer 1.25 inches Fully Multi Coated Reducer for Telescope Eyepiece Photography and Observing (Reducer) : Electronics
Agena's Guide to Focal Reducers
Bresser | Vixen 0.71x Focal Reducer for VC200L | Expand Your Horizon
SVBONY Reducer for Telescope 1.25 inches 0.5X Focal Reducer with C-Mount Adapter to CCD Camera for Telescope Eyepiece Photography and Observing : Amazon.ca: Electronics
Crop Factor Calculator
Astro Blog Delta « Celestron f/6.3 reducer/corrector with DSLR on C9.25 «
Frustrations with focal reducer - Experienced Deep Sky Imaging - Cloudy Nights