Top Orion Skyscanner 100mm Review SecretsThe actual "optimum range" in your telescope is using a 8mm up to a 16mm eyepiece which supplies you amongst a 2mm and 4mm exit pupil or 25 and 50x magnification. When you needed to put the tube on a special mount, you are able to do that as well. The dovetail bar is compatible with all kinds of other Orion