BorHa
Newbie
I was wondering if anyone could help me with an issue I have with my 35mm 1.4 Nokton. I was having a front element wobble and I make a mistake of unscrewing and winding off the M mount plate from the body of the lens. I am having trouble aligning the mount to match up with the rest of the lens body. Does the mount or focus have to be in a certain position to properly screw everything in? At the moment, I can screw it back on and line everything up, but the focus throw stops short of the .7 measure and when I tried to use it on my sony a7, everything was out of whack.
Any help would be greatly appreciated!
Any help would be greatly appreciated!
Maybe similar to an issue I had with a 35mm Summicron (pre-ASPH), which at manufacture was assembled one thread off on the focusing helix. Focus was off enough to notice at wide apertures; stop down a couple stops and you'd never know. Indeed I did not know until I had it in to a local repair guy for CLA after about 35 years!
It's important that the lens is reassembled at the correct thread position. The key to this is to be very observant in disassembly and put small marks on the pieces to aid getting it back right. In my case, after it was finally assembled correctly the focus movement was a little rough, as the thread mating surfaces were different, not worn into a smooth engagement.
Unsure that my local guy really was right about this, when I had the lens off to DAG for coding and focus check some years later, he confirmed the local guy had assembled it right!
All this is not very helpful to you in your predicament. I'm not a repair tech, just an engineer, so I'd just suggest reassembling the lens and check focus wide open. If it's not "on", try again one thread one way or the other. Etc! I would send it off to someone with an optical bench, who knows what they're doing, but it might be educational challenge to try it oneself.
It's important that the lens is reassembled at the correct thread position. The key to this is to be very observant in disassembly and put small marks on the pieces to aid getting it back right. In my case, after it was finally assembled correctly the focus movement was a little rough, as the thread mating surfaces were different, not worn into a smooth engagement.
Unsure that my local guy really was right about this, when I had the lens off to DAG for coding and focus check some years later, he confirmed the local guy had assembled it right!
All this is not very helpful to you in your predicament. I'm not a repair tech, just an engineer, so I'd just suggest reassembling the lens and check focus wide open. If it's not "on", try again one thread one way or the other. Etc! I would send it off to someone with an optical bench, who knows what they're doing, but it might be educational challenge to try it oneself.