Gear Talk > What the Nerds Do
Blemish inside 16mm 3.5 rear element
pluton:
--- Quote from: Snoogly on January 20, 2022, 07:14:48 ---
It’s such a hard lens to figure out what is going inside, without fully opening it up. Looking from the front it’s hard to see any issues with the glass, and looking from the back it’s hard to see further than the closest group. Inscrutable …. :(
--- End quote ---
My copy made 2 visits each to 2 repair services (4 total) just to get re-greased, internal filters cleaned, and reassembled correctly. Inscrutable indeed!
PS: What annoyed me was not that the lens proved difficult tor professionals to service, but that it was handed back to me three times in a clearly un-repaired condition.
Akira:
Special lenses such as the fisheye should be more tricky to assemble because of the tolerances tighter than, say, not-so-fast standard primes.
When I tried non-Ai Nikkor 20/3.5 (72mm filter thread) for the first time on F3, I was surprised by its pronounced barrel distortion. On the contrary, the one I finally purchased later didn't suffer from any perceivable distortion. The optics of the first sample was perfectly clean. I think that the first sample was badly assembled after it was cleaned and lubricated.
Unlike more modern lenses, the older MF Nikkors needed to be assembled by well-trained technicians using a handful of specialized tools.
Snoogly:
Well, he had the lens for over two months, and I got a bit angry with him. He’s just a one man show, but two months with no news at all was worrying.
Then yesterday I received a mail saying it is fixed! No real explanation for the two month black hole of information, but I sent the $150 repair cost via PayPal, and now just have to wait …. again.
Snoogly:
Another update …
I got some photos, but he found some bubbles between the bonded elements, so he will separate and re-cement again later this week.
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