Askar 0.7X Full Frame Reducer for FRA400C Refractor - FRA400C-RED Seestar Smart Telescope and back focus is easier

and back focus is easier to deal with

Celestron's Rowe-Ackermann Schmidt Astrograph (RASA) 36 cm is also an excellent choice for advanced astroimaging

Includes standard 2" size

Easy to use as X-Y-Z:

97% transmission at 656nm (H-alpha)

Askar 0.7X Full Frame Reducer for FRA400C Refractor - FRA400C-RED Seestar Smart Telescope and back focus is easierThis triplet reducer is specifically designed for the Askar FRA400C, and will reduce the overall focal length to 280mm and the focal ratio to f 3. 9. Adding the reducer to the FRA400C will still allow full frame imaging and the back focus is a standard 55mm. The shorter focal ratio (from f 5. 6 to f 3. 9) enables the telescope to achieve a wider field of view and faster exposure times, making it ideal for capturing large nebulae, star clusters, as