The celestron nexstar 4 se computerised telescope is a 4 maksutov cassegrain telescope which combines the classic heritage of the original orange tube telescopes with the latest state of the art features the starbright xlt high transmission coatings come standard with the starpointer finderscope to help with alignment and accurately locating objects it has an iinternal flip mirror for viewing straight through with optional diagonal or at 90 degrees there is a quick release fork arm mount