Stephen Thomason
7-Dec-2015, 11:04
I just received a Goerz Apo Red Dot Artar 14 inch in beautiful condition. HOWEVER, I cannot get the retaining ring unscrewed.
It looks to me like it hasn't been unscrewed since new, since it was mounted by screws originally when it was used on a process camera. I believe the retaining ring unscrews, since I have a Sinar board that is supposed to have been threaded to accept this model lens.
Before I put anything like PB Blaster or other solvent fluid, I think it best to ask for some expert advice. This is my first barrel process lens, so I need and appreciate your advice and input.
I have read the following thread, but I was under the impression that this Artar is in a brass barrel - it is certainly heavy enough! If there is aluminum, and if the lens is experiencing cold-welding, then that's fine. I'll just drill some holes in the threaded lens board and use it like that.
http://www.largeformatphotography.info/forum/showthread.php?63670-Disassembling-old-cold-welded-aluminium-barrels&highlight=disassembling+process+lens
It looks to me like it hasn't been unscrewed since new, since it was mounted by screws originally when it was used on a process camera. I believe the retaining ring unscrews, since I have a Sinar board that is supposed to have been threaded to accept this model lens.
Before I put anything like PB Blaster or other solvent fluid, I think it best to ask for some expert advice. This is my first barrel process lens, so I need and appreciate your advice and input.
I have read the following thread, but I was under the impression that this Artar is in a brass barrel - it is certainly heavy enough! If there is aluminum, and if the lens is experiencing cold-welding, then that's fine. I'll just drill some holes in the threaded lens board and use it like that.
http://www.largeformatphotography.info/forum/showthread.php?63670-Disassembling-old-cold-welded-aluminium-barrels&highlight=disassembling+process+lens