1. Catadioptric. 2. Computer Aided Telescope.
Telescope that combines reflection and light bending (refraction),
like Schmidt-Cassegrains, Maksutovs.
System that supports a mirror or a lens.
Layer of metal or dielectric that is applied on a surface.
Most important coatings are optical coatings. Lens
coatings help minimizing the reflection losses at the
surfaces, while mirror coatings have enhanced reflective
properties and also protect the reflective film against
corrosion (as a SiO2 coating atop of a reflective Al
coating on mirrors).
Spring made of a wire put in a coil (like a wine-opener)
Adjusting all optical elements such that they share a
single optical axis.
Computer Aided Telescope
Telescope that is driven with the help of a computer.
Examples are stepper motor driven Alt-Azimuth mounts.
The part of a mount, special on GEM's, to rest the tube.
Sort of focuser which is based on pure friction. Very
often this focuser design has very little to no backlash.
Cassegrain Telescope (without corrector plate). A