על ידי רב ברכה focal reducer תיאבון לעורר ללא קשר ל
SVBONY 2 Inch 0.8x Focal Reducer / Flattener for SV503 102F7 f/7 Refractor | eBay
GSO 2" 0.5x Focal Reducer
Agena's Guide to Focal Reducers
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
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
Explore Scientific 3" Field Flattener and .7x Focal Reducer - Camera Concepts & Telescope Solutions
What can a field flattener or focal reducer do for my telescope? | BBC Sky at Night Magazine