Newton's reflecting telescope produced much clearer pictures than the old kind of telescope.
VOA: special.2011.06.01
And when its aluminium coating is replaced with silver in a year or two's time (a huge vacuum-chamber housed at the telescope's base will be used to deposit metallic vapour on to the mirror's reflecting surface), it will be able to see into the infra-red with equal clarity, opening up a much neglected area of astronomy.