Gain, magnification from 7times to 45 time. or 3.5 to 90.what is different between x7-x45 and x3.5-x90 ?
Yes , definitely Stereo microscope is something different and i have never seen any professional to use digital microscope.I tried on of those USB digital microscope and found its depth of field to be terrible. A couple of mm at best. If you can afford it, I really think an optical stereo microscope is the way to go.