Beginners Guide to GoTo Telescopes
When venturing out and buying your first telescope, there are a number of factors to consider, but because of glossy advertising and our current digital age, the first telescope that people think of is a GoTo computerised telescope.
Do you really need a GoTo or would a manual telescope suffice? In order to make a good decision on what to buy, you need to decide on what you want to use the telescope for — observing, photography, or both and does it need to be portable or not? This will help you make the best decision for the mount of your telescope and whether or not it needs to be a GoTo.
GoTo telescopes are usually advertised as being fully automatic and once they have set themselves up, or are set up by the user, they can access and track and many thousands of stars or objects with just a simple touch of a button. These features have made GoTo telescopes very desirable with many astrophotographers.
Manual telescopes such as Dobsonians are not automatic or driven by motors as GoTo telescopes are. They are predominantly used for observing (using your eyes instead of a camera) and the scope is moved by hand or by levers by the user to find different objects in the eyepiece. Manual telescopes usually have a finder scope, red dot finder or laser finder to aid in finding objects in the eyepiece. They are unable to track objects, which can make them unsuitable for photography.
GoTo Vs Manual Telescopes
Compared to GoTo’s, manual telescopes are much more economical as you are basically buying a very simple mount and an optical tube assembly (the telescope tube, or OTA). With GoTo you are adding electronics and control mechanisms to drive the scope, which can add heavily to the cost. A small GoTo telescope could cost the same as a lot larger manual Dobsonian telescope.
Good GoTo telescopes make astrophotography very accessible and enjoyable, especially with the addition of cameras and other kits. As opposed to manual scopes, they can be used for long exposure astrophotography. Be aware though, that much astrophotography is done with very expensive imaging equipment, but good results can be achieved with web cams and DSLR cameras.
Manual telescopes are brilliant at helping you discover and learn the sky as you have to actually hunt or star hop for different objects. I once met a person who had been using a GoTo heavily for a year, and at a star party I asked her to show some kids where a well-known star was with my laser pointer, she didn’t know because she was used to her GoTo scope taking her to objects!
So which telescope should you buy GoTo or Not GoTo?
I would recommend for pure visual observing a manual telescope such as a large Dobsonian or Newtonian telescope. The human eye needs as much light to enter it as possible to see things in the dark, so a big aperture or mirror means greater light gathering and more light entering your eye, so you can see more. What you saved by not having GoTo, you can spend on increasing the size of your telescope.
If you want to add photography or imaging capabilities then I would definitely recommend a good quality GoTo scope or mount. You will get a smaller aperture compared to the manual scope for the same money, but the goto computerised scope will track for astro-imaging and can also be used for visual observing. Be prepared to spend a lot more money for a good quality GoTo system though.
Consider how you want to use your telescope and the size of your budget. Avoid buying low-end, cheap, budget, or what is known as “department store” equipment to avoid disappointment. Save up a little longer and get a good telescope. Visit your local astronomy store and before you buy ask an astronomer about GoTo scopes, they will be glad to help.
I hope you enjoy your new GoTo telescope if you decide to own one for many years to come