Should additional light be necessary, a regular flashlight held against the other end, or a Titan Intra-light is more than adequate. It weighs only 4 ounces and can be carried in a pocket. This is caused by the characteristics of the zoom fish-eye lens. It has its own eyepiece and internal objective lens. It is .990 inches in diameter and 4.500 inches long.
All lenses are color coated.
The image may be somewhat blurry when you look through both units. This can be remedied by adjusting the eyepiece of the Magnification Booster in or out until a crystal clear, sharp image is obtained. It is, however, very important that the inspection of a bore first be made without the Magnification Booster. It is impossible to adjust both units at one time. Magnification Booster AZB-1 should not be used for any focal plane closer than 2 inches, or for short pipes or tubes.