VERY RARE FAST PETZVAL TYPE BRASS LENS COVERS 6×9 cm. COVERS ABOUT 6×9 cm. According to measurements it has a focal distance of about 11-12 cm. And an aperture about F2.8-F3.5. According to measurements it covers about 6×9 cm or some more. LENS HAS BEEN PROFESSIONALLY SERVICED AND CALIBRATED. Glass is excellent without damages, fungus, fog or separation. Rack and pinion mechanism works excellent. Lens designs assumes no aperture and no waterhouse slot. The brass barrel is in excellent condition. Lens is about 0.9 kg in weight. Height = 120 mm. Front barrel diameter = 70 mm. Mounting thread diameter = 75 mm. This is a fantastic lens for usage or. Comes a very rare brass cap. Buyers with a feedback of less than 10 points should contact me first!