The celestron nexstar 102 slt computerised telescope offers a 63 increase in image brightness over 80 mm models this short tube telescope with a fast f5 optical system gives images that are bright and crisp and is a powerful 4 telescope because of its wide 17 degs field of view the nexstar 102 slt is optimal for scanning large areas of the sky and for superb land viewing using celestrons patented skyalign patent pending simply input the date time and location into the hand contro