Refractors use a lens system to produce images.
Refractors require the least maintenance of all telescopes.
Although all telescopes produce an inverted image, refractors use a star diagonal to turn the image up the right way, although it will be flipped left to right.
Refractors are either Achromat or Apochromat. Apochromats, which are generally more expensive, do not suffer from false colour.
Reflectors use a system of mirrors to produce an image.
A reflecting telescope offers the best £ per inch of aperture ratio - a large mirror is cheaper to make than the equivalent sized lens.
The largest amateur telescopes are reflectors.
Reflectors are not suitable for terrestrial viewing as the image will always be inverted.
Catadioptric or compound telescopes, use a combination of lenses and mirrors to produce the image.
They are the most compact design, giving shorter tubes that are typically 1/4 the length of reflectors and refractors.
Catadioptrics come in two designs - Maksutov-Cassegrain (Mak's) and Schmidt-Cassegrain (SCT's). SCT's tend to be more expensive.
Catadioptrics use a star diagonal, so are therefore suitable for terrestrial viewing.
Telephone 01823 665510
- Zenith SCHOLARIS-400 Dual LED Biological Microscope 60045
- Orion 8x20 Compact Monocular with 30x Microscope Stand 5639
- Orion FunScope Astro Dazzle 4.5" Reflector Telescope Kit 21403
- Orion StarSeeker IV 102mm GoTo Mak-Cass Telescope 13162
- Orion StarShoot AutoGuider & 60mm Guide Scope Package 21404
- Orion 40th Anniversary SkyQuest XT8 Dobsonian Telescope 9702