Do you have long-focus microscope which can be used from the long distance?
Yes, we have WL-1 type which can observe more than 300mm from the long distance position.
WL-1 can be focused to a working distance from 300 mm (17.5×). infinity (8×), and its crosshair scale markings are very useful for positioning.
Combination set WL-1-FR is also very popular.