Author Topic: Dismantling the Micro-Nikkor 105/2.8 Ai-S lens!!!  (Read 2814 times)

richardHaw

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Dismantling the Micro-Nikkor 105/2.8 Ai-S lens!!!
« on: February 19, 2017, 09:40:56 »
http://richardhaw.com/2017/02/19/repair-micro-nikkor-105mm-f2-8-ai-s/

This little lens got me. I made a wrong mark and that cost me a whole night of pain. :o :o :o

Bjørn Rørslett

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Re: Dismantling the Micro-Nikkor 105/2.8 Ai-S lens!!!
« Reply #1 on: February 19, 2017, 09:55:27 »
Seeing Erik's efforts in disassembling and reassembling this lens makes makes me appreciate your blog entry :D

Akira

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Re: Dismantling the Micro-Nikkor 105/2.8 Ai-S lens!!!
« Reply #2 on: February 19, 2017, 10:11:57 »
Apparently one of the most formidably challenging lens...  Well done, Rick!
"The eye is blind if the mind is absent." - Confucius

"Limitation is inspiration." - Akira

richardHaw

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Re: Dismantling the Micro-Nikkor 105/2.8 Ai-S lens!!!
« Reply #3 on: February 19, 2017, 10:45:32 »
Seeing Erik's efforts in disassembling and reassembling this lens makes makes me appreciate your blog entry :D
I see. This would've been routine and easy but I just got the mark wrong for the front CRC unit's tolerance :o :o :o

richardHaw

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Re: Dismantling the Micro-Nikkor 105/2.8 Ai-S lens!!!
« Reply #4 on: February 19, 2017, 10:46:15 »
Apparently one of the most formidably challenging lens...  Well done, Rick!

I know another guy who got stucked :o :o :o

same part as me ::)

Nasos Kosmas

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Re: Dismantling the Micro-Nikkor 105/2.8 Ai-S lens!!!
« Reply #5 on: February 19, 2017, 11:23:45 »
It's a lot of work and an excercise for memory, i have done this on some of my 50mm lens with one helicoid and that's simple
I remember the Nikon service people they had a tool like reverse telescope where they checked focus to infinity
Very good job Ric!

Erik Lund

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Re: Dismantling the Micro-Nikkor 105/2.8 Ai-S lens!!!
« Reply #6 on: February 19, 2017, 11:23:53 »
Very Nice Rick! Great job ;) Thanks for posting.

Remark; When doing the disassembly, I keep the 'top' of the lens up to see where things/threads separate, I make my 'assembly marks' preferably at the very top of the lens or at the Infinity mark on the barrel and focus ring, CRC etc. so I have the top position for all loose parts if there is no doubt as to what is 'top' - This helps to keep a general orientation of all things.
Erik Lund

richardHaw

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Re: Dismantling the Micro-Nikkor 105/2.8 Ai-S lens!!!
« Reply #7 on: February 20, 2017, 08:23:30 »
It's a lot of work and an excercise for memory, i have done this on some of my 50mm lens with one helicoid and that's simple
I remember the Nikon service people they had a tool like reverse telescope where they checked focus to infinity
Very good job Ric!
Thanks!
As for the tool, it's called a collimator. I have instructions on how to make one but it involves the destruction of a Nikon F :o :o :o I am going to do that on a Topcon or a Canon instead ::)

richardHaw

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Re: Dismantling the Micro-Nikkor 105/2.8 Ai-S lens!!!
« Reply #8 on: February 20, 2017, 08:28:04 »
Very Nice Rick! Great job ;) Thanks for posting.

Remark; When doing the disassembly, I keep the 'top' of the lens up to see where things/threads separate, I make my 'assembly marks' preferably at the very top of the lens or at the Infinity mark on the barrel and focus ring, CRC etc. so I have the top position for all loose parts if there is no doubt as to what is 'top' - This helps to keep a general orientation of all things.

Thanks for the tip! I usually do it from the bottom, I don't know why. but marking it from the top makes more sens I think :o :o :o

this lens has acquired some notoriety. a reader messaged me that Nikon Canada won't service his ::) despite having an expert from Japan ::)

a friend messed up his a few years back. he named the lens Humpty Dumpty ::)

Roland Vink

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Re: Dismantling the Micro-Nikkor 105/2.8 Ai-S lens!!!
« Reply #9 on: February 22, 2017, 23:27:31 »
Impressive! That is a very complicated lens internally, and very good optically.
My copy is relatively recent and in good shape, so hopefully won't need to be opened up for a long time :)

Erik Lund

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Re: Dismantling the Micro-Nikkor 105/2.8 Ai-S lens!!!
« Reply #10 on: February 22, 2017, 23:40:18 »
The weak spot is the front group, the guides are very small and secured with even smaller screws - so take care / be gentle when mounting and dismounting filters or lens hoods on the front filter threads.
Erik Lund