A huge Petzval lens without name nor brand. Looks like English stuff Ross? Very well built and heavy with high quality glass. With rack & pinion focusing system working as it should (one screw is missing on plate). There is a waterhouse slot (no waterstop included).
Front achromat has a slightly cement separartion on the very edge (without any effect on taking picture). Rear group is complete with 2 glasses separated with metal ring, nad there is a tiny spot and very small chip on one glass (see attached picture). There is "10 1/2 in" pencil handwritten on one glass, seems to be back focale distance. Diameter at mounting thread: 100mm. This lens covers full plate at infinity and 8x10in at portrait distance.A nice tool in working order for large format photographers and wet plat enthusiasts. Check out my other antique lenses for sale. L'item "Early PETZVAL no-name f4 320mm large format 8x10 portrait lens" est en vente depuis le mercredi 30 janvier 2019. Il est dans la catégorie "Photo, caméscopes\Photographie ancienne\Objectifs anciens". Le vendeur est "75photographica" et est localisé à/en Paris, Ile-de-France. Cet article peut être expédié aux pays suivants: Amérique, Europe, Asie, Australie.