In order to improve the collimation of the C11 both at prime focus and with the hyperstar a few modifications were necessary. The ability to collimate the primary mirror was the answer. This ensures that you can always place the primary focal point on the same optical axis as the corrector and the secondary mirror. Having the ability to tilt the three components on the light path like in a newtonian system ensures you can iterate towards a very accurate collimation with less mechanical constraints such as imperfections in machining of the cell or baffle.
The main challenge was to fit the new tilt system behind the primary mirror while keeping the original focuser design. So how do you hold a heavy piece of glass with three bolts without stressing it and still allow it to travel along the tube for focusing? Time, trial and error.
The main constraints were as follow: