More about GO TO telescopes
These instruments have revolutionised the market in the past few years. They were introduced with the promise that the telescope user could now get on with observing objects, rather than just finding them. But many people, especially the beginners for whom they could be so useful, are disillusioned with them. The fact is that it is not easy for any beginner to get the hang of an astronomical telescope straight away – you wouldn't expect to go out and buy a car without passing your driving test.
The larger GO TO instruments, such as the Meade LX90 and LX200 instruments, have a better reputation than the smaller ones and if you are fortunate enough to get one that works well you will love it.
The Celestron SkyAlign system works very well for beginners, much better than the Meade Autostar system in my view. You don't need to put the telescope into a home position, but you simply locate three bright stars or planets in the sky, without having to know their names. Quicker and more accurate than the Meade system.
Page 21 – hand-held terrestrial telescopes
I also tested the Sky-Watcher ST1545, a 15-45x 50 terrestrial telescope which comes on a table tripod. Though it gave adequate images by day, and did allow me to view stars by night (including globular cluster M13) it was not really good enough to be recommended as the full aperture of the instrument could not be used. The images were dim at 20x compared with the Turist-3.
I hope the Turist-3 again becomes widely available as it is an excellent instrument. However, a similar telescope is still listed by the US supplier russianoptics.com as of late 2009, though out of stock.
43 – small reflectors
Page 63 – Collimating a reflector
Celestron appear to have withdrawn their own polar alignment scope for their CGE mounts.
Page 97 (2009 edition only)
Those are all the updates on the text available at the moment.
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