VERY RARE FAST DALLMEYER PETZVAL TYPE. Made by Dallmeyer, London. There is a number 5252 to the left from the Dallmeyer Brand. Which gives the lens a solid historical value. According to measurements it has a focal distance of about 5.5 (14 cm). And a Maximum F-Value to be about F2.8. It covers up to 4×5. Lens has been professionally serviced. Looks very well with signs of use. Glass is very good without damages, fungus, fog or separation. Rack and pinion mechanism works excellent. There is a waterhouse slot for F-Stops. The brass barrel is in good condition with signs of use. Rack and pinion works fine. Lens is about 0.5 kg in weight with flange and a wooden plate. Height = 90 mm. Front barrel diameter = 58.5 mm. Front lens diameter = 50 mm. Rear barrel diameter = 58.5 mm. Rear lens diameter = 50 mm. This is a fantastic lens for usage or. Barrell is in nice condition. Buyers with a feedback of less than 10 points should contact me first!