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Hi,
You just need to know the FL of your scope. For a refractor just run a tape measure from the front of the lens along the length of the scope for the stated focal length. If this is outside the extended full length of the drawtube then you need an extender.
In any case this will give you a rough idea of where the CCD of the DBK should be placed to get a focussed image.
EDIT, obviously this only works for a simple refractor, which i think you have.
Paul
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