Except for certain super telephoto lenses and special lenses, this conversion lens can be used in virtually all PENTAX replaceable lenses for expanding the focal length by 2X.

Except for certain super telephoto lenses and special lenses, this conversion lens can be used in virtually all PENTAX replaceable lenses for expanding the focal length by 2X. The open F value becomes two steps darker, but the iris control mechanism can be used, and shooting can be performed at program automatic exposure and shutter speed priority automatic exposure. The minimum shooting distance does not change with this lens. The lens is focused using the manual focus.