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This focusing is performed using the coherent guiding bundle in the following way: a bright star is observed with this bundle, in order to follow the image variations on the TV screen. This process is best done if the coherent bundle can be put in the centre of the aperture plate (ie, focal plane centre). If this is not possible, the bundle coordinates must be known accurately so that the telescope can be offset to put the star onto the coherent bundle. It is advisable to use the high quality zone of the fibre bundle for focussing