The extension tube is used with OM-System lenses to take close-ups of flowers, insects, and other small objects as well as for copying documents, maps, charts, etc. The focusing and viewing accuracy of the OM-System is of particular value in this type of photography.
This 25mm bayonet mount extension tube can be used with OM-1 standard lenses either singly or in combination to provide different extension lengths. The 25mm extension tube can be used separately to extend the magnification range of the ZUIKO macro lens 50mm to 1/2× and 1:1 (life size).
OM-System macro lenses, optically optimized for best performance at specific magnifications, can be used with extension tubes to further enhance your macrophotographic ability with the OM-1 camera. For example, the ZUIKO macro lens 50mm F3.5 is designed to maintain high resolution throughout its entire focusing range and can be used with the 25mm extension tube for magnifications from 1/2× to 1:1.