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Davo not all the big planet team use a 5x. Some of us use a 2.5x.
Incidently, barlows can be used in several situations. For example, if you want to view a close double star, you can use a barlow to split the two stars. They can also be used for planetary viewing on nights of good seeing. And they can also be used to view galaxies and planetary nebulas. Their use is to primary divide the focal length of you EP's. This can mean that if you have EP's of high focal length a barlow will effectively double your EP's There is no need to get smaller EP's to cover the magnification gap.
In other words, they can be used for many purposes. They do however, require nights of good seeing to be very effective.
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