Celestron NexStar 6SE: 6" (150mm) Schmidt-Cassegrain telescope w/ GoTo tracking mount.
Meade 2045: 4" (102mm) Schmidt-Cassegrain telescope w/ tabletop sidereal tracking mount
Meade ETX90: 3.5" (90mm) Maksutov-Cassegrain telescope w/ GoTo and sidereal tracking mount