An optical telescope gathers and focuses light mainly from the visible part of the Electromagnetic spectrum (although some work in the infrared and ultraviolet). Optical telescopes increase the apparent angular size of distant objects, as well as their apparent brightness. Telescopes work by employing one or more curved optical elements - usually made from glass - lenses or mirrors - to gather light or other electromagnetic radiation and bring that light or radiation to a focus, where the image can be observed, photographed, studied, or sent to a computer. Optical telescopes are used for astronomy and in many non-astronomical instruments, including: theodolites (including transits), spotting scopes, monoculars, binoculars, camera lenses, and spyglasses. There are three main types:

The refracting telescope which uses solely an arrangement of lenses (excluding star diagonals). 
The reflecting telescope which uses solely an arrangement of mirrors (excluding eyepieces). 
The catadioptric telescope which uses a combination of mirrors and lenses, and usually have a glass corrector plate at the front. 

Mercury Series: 609

Economically priced, easy to use entry level scope with quality fully coated optics. Bonus features include strong, lightweight aluminium tripods and potential upgradability with standard 1.25" accessories. An optional R.A axis motor drive is available for the Mercury-609 model.

Standard Specification: Magnification Range x45, x90, x112.5, x225 Objective lens diameter 60mm Telescope Focal Length 900mm (f/15) Eyepieces Supplied (1.25") 8mm & 20mm x2 Barlow Lens 6x24 Finderscope Sun projection Screen EQ-1 Equatorial mount Aluminium Tripod with accessory tray

Product Code: 391
 
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