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Note also that, with a German mounting, the whole tube is offset from the centre of the mount. 3 m (3–4 ft) when it is pointing at low altitudes. You can see from the diagram that distance A is almost equal to the length of the tube. 5 m (4–5 ft) in order for the observer just to be able to squeeze round. But there will need to be furnishings in the observatory. There will need to be a chair, or stepladder, shelves, may be a cupboard, and almost certainly a desk. 3 m (1 ft) onto this required radius.
A dec. drive operated from the same handset as the RA drive is preferable, and it must have a reversible motor (synchronous motors are not normally reversible). The dec. gearwheel is often much smaller than the RA gear because less precision is needed in dec. adjustment. On an altaz mount, both gears would be the same size. All in all, it must be said that to make a satisfactory equatorial mounting is more difficult than to make a satisfactory telescope, in that it needs more skill Telescopes and Techniques and more equipment.
These tiny, massproduced cameras were designed for purposes such as video-conferencing over computer links, and when the first amateurs started trying to record astronomical images with them, most were highly sceptical that anything would be achieved. However, the technique has been developed spectacularly, achieving resolution undreamed of from amateur equipment only 10 years ago, even surpassing Telescopes and Techniques the best results from professional telescopes of that era, and approaching the resolution achieved by some space-probes.