Reflectors do require higher maintenance because the mirrors must be occasionally realigned to maintain optimal performance. This is accomplished by using a fairly complex arrangement of mirrors. The corrector plate is located at the front of the telescope and there is a large mirror located at the back of the telescope. The compact design makes this type of telescope one of the most popular for serious amateurs. Both are considerably more expensive than similar size Newtonian telescopes.
All telescopes share some common features and terminology.