How should I select a telescope

select a telescope

The telescopes are categorized in three categories depending upon the optics used.

1. Refractor Telescopes: Refractors use lenses as optics at both the ends of the tube to achieve Magnification. Galileo used a Refractor telescope around 400 years back. They are easy to use and require less maintenance, but on the other hand they are costly. The cost of the refractor rises exponentially as the size of the aperture(main lens) increases. Refractors are used for both planetary observations and Astro Photography. 2. Reflector Telescopes India: Reflectors use primary and secondary mirror as main optics. Reflectors are economical as compared to Refractor telescopes. Reflectors are majorly used when big aperture is required to view deep sky objects due to its economical value. Reflectors are also used for Astro Photography. 3. Catadioptric Telescopes Mumbai: They are easy to use, compact and are power packed. They have large focal lengths to have better depth of the object, and the size of the tube is reduced drastically, thus it can be transported easily. It is also majorly used for Deep Sky Photography as well as Deep sky Visual Observation. 4. Dobsonian Telescopes: A Dobsonian telescope is variation of an alt-azimuth mounted reflector telescope. Dobsonian telescopes are simple and easy to use. They are compact, rugged and portable and are great for deep sky viewing.

Q. What Is a Telescope Mount? Which one should I buy?

Mountsthe base on which OTA (Optical tube assembly) is fixed. Fundamentally there are two types of Mounts a. Equatorial a. Altazimuth

Dobsonian mount is basically an Altazimuth mount. GoTo or Computerised can be both Altazimuth and Equatorial.

All the above mounts can be controlled manually called Manual Mounts, through motor called Motorised Mounts and computerised called GoTo Mounts. A. Manual: The movements are controlled manually. There are two types of movement which are called RA and DEC. RA movement is for achieving Azimuth movements or horizontal movements and DEC movements is for achieving altitude movements or vertical movements. But the movements are relative to the polar movement. It moves relative to polar axis movements.

B. Motorised: The movements are controlled by the help of gears which can be moved electronically to track the desired heavenly object.

C. GO TO: This is an automatic motorised machine which can point and track any object in the sky automatically with the help of a pre-fed database in its system. Hence the name GoTo. There are around 40,000 objects database normally fed in the system. The machine has to be initialised first by telling the co-ordinates (longitude and latitude) , local time and Altitude of North pole, where it is placed. There are various other techniques to initialize the machine.

Q. What are Tripods?

Tripods: Tripods are stands on which the mounts are placed. Thus a Tripod supports a mount and the telescope/OTA. Tripods are of various types. Light or heavy, Aluminum or Stainless Steel.

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