Svbony SV193 0.8x Focal Reducer/Flattener for SV503 70mm ED Refractor

Focal reducer and field flattener is one of the essential accessories for astrophotography; SV193 0.8x focal reducer and field flattener for the Svbony SV503 70mm ED refractor telescope With the advanced SV503 70mm ED Refractor; SV193 0.8x focal reducer can take dazzling celestial photos without worrying about the distortion of the star points on the edge of the photo The front end has M54 thread that connects directly to the SV503 70mm ED Refractor focuser; and the back end is M48x0.75 threaded to connect to the camera bayonet; support Full Frame Camera The 0.8 times defocusing system shortens the exposure; it can meet the needs of astrophotographers who need sufficient exposure in a short time   Description     California Residents: Please check Proposition 65 Warning Website about significant exposures to chemicals that cause cancer, birth defects or other reproductive harm. https://www.p65warnings.ca.gov/   Specifications Model SV193 SKU  W9152A W9152B W9152D Back focus 55mm Barrel size M54x0.75 2-inch 2-inch Threads Standard M48*0.75 M48*0.75 M48*0.75 Lens Structure 3-Elements/3Groups 3-Elements/2Groups 3-Elements/2Groups Lens Coating FMC FMC FMC Blackened Lens Edges Yes Yes Yes Net Weight  273g / 9.63oz / 0.6lb 164g / 5.78oz / 0.36lb 177g / 6.24oz / 0.39lb   What's included Svbony SV193 2" 0.8x Focal Reducer/Flattener for SV503 70mm ED Refractor