RASA & HyperStarhttps://astronomynow.com/2016/06/01/celestron-rowe-ackermann-schmidt-astrograph/
A HyperStar3-enabled Celestron C11 optical tube (left) permits one to image at similar photographic speeds to the new Rowe-Ackermann Schmidt Astrograph (RASA), but the HyperStar corrector lens system is not optimised for the optical tube that it is used with. RASA is a tightly-integrated system optimised for full-frame sensors, whereas HyperStar3 is limited to APS-C-sized DSLRs. Image credit: Ade Ashford.
Celestron RASA 8" or Edge HD 8" with a HyperStar
EdgeHD scope (about $1,000),
Celestron 8" RASA ($1,699)