Lens construction: 7 elements in 5 groups
Focal length: double that of lens in use
Aperture coupling range: f/2~f/32
Effective Aperture: f/4~f/64
Diaphragm: Automatic diaphragm coupling provided
Exposure measurement: Via full aperture method meter coupling ridge provided for AI cameras
Reproduction ratio: double that of lens in use
Depth of field: Half that of value for selected lens aperture
Closest focusing distance: same as that of lens in use
Weight:230g