These USB Microscope Cameras are designed with the C-mount standard, and include a 0.5X reduction lens and two adapters. These kits enable the reduction lens to fit either 23.2mm, 30mm, or 30.5mm trinocular photo ports or eyetube ports.
The 0.5X reduction lens zooms out from the image, and increases your field of view to get closer to what you would see through the eyepieces.
The USB camera uses the included USB 2.0 to connect to a computer or laptop, and draws power from the USB connection, so no additional power cables are needed.