Svbony SV193 2-Inch 0.8x Focal Reducer / Flattener for 80 ED Refractor. svbony sv305m The guest pagers could be

The guest pagers could be set with beep

Notice time 30s

Dynamic lens focusing system

After extensive research and development

Svbony SV193 2-Inch 0.8x Focal Reducer / Flattener for 80 ED Refractor. svbony sv305m The guest pagers could beDesigned for fixed field astrophotography with the SV503 refractor. While the SV193 will also thread into many other f 6f 7 refractors using 2" focusers, performance cannot be guaranteed on all optical systems. The 0. 8 reducer provides a wider field, finer star points and an improved signal to noise ratio under the same exposure time. In addition to reducing the focal length for faster imaging, the integrated field flattener corrects the natural