Lens Mount: PLFocal length: 200mmField of view: 12 °Frame size: 24 × 36 mmNumber of lenses / groups: 4/3Working distance - 45.5Aperture ratio: 1: 4Aperture scale limits: 1: 4–1: 22Aperture blades - 8Aperture adjustment - blinking, manual (A / M switch)Near focusing limit - 1.8 mPlease any questions!Have a nice day!