Consists of bellows unit, lens mounting base, rail, and tripod mounting seat.
Used by attaching between the camera and lens.
Usable lenses are 20-200mm.
When a 20mm lens is attached in reverse, magnification shooting up to approximately 11x is possible.
Exposure is determined by stopped-down metering, but if the double cable release AR-4, 7, or double release AR-10 is attached to the camera and lens mounting base, the lens's automatic diaphragm and the exposure meter will link.
Focusing is possible with the diaphragm wide open.
