The main optical body of the DynaZoom is sophisticated. There is an optical prism to split the image to the eyepieces. As the interpupilary distance is changed the eyepieces extend or retract to maintain the length of the optical path. As the interpupilary distance is adjusted the image remains in focus and undisturbed. The silver knob on the top of the body operates the 1X-2X par focal optical zoom feature.
Residual color is next to nil.
The eyepieces are of the wide-field, high eye point type that are particularly comfortable for those wearing eyeglasses. The light source is an incandescent bulb that puts out a lot of light for use with dark field and phase contrast attachments. Using the lower power objectives without the neutral density filters generates a field bright enough to be unpleasant. I am sure this description will interest many British readers. It sounds like an excellent professional quality stand.