Dismantling the Micro-Nikkor 105/2.8 Ai-S lens!!!

[richardHaw]

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.

[Bjørn Rørslett]

Seeing Erik's efforts in disassembling and reassembling this lens makes makes me appreciate your blog entry

[Akira]

Apparently one of the most formidably challenging lens...  Well done, Rick!

[richardHaw]

Seeing Erik's efforts in disassembling and reassembling this lens makes makes me appreciate your blog entry

I see. This would've been routine and easy but I just got the mark wrong for the front CRC unit's tolerance

[richardHaw]

Apparently one of the most formidably challenging lens...  Well done, Rick!

I know another guy who got stucked

same part as me

[Nasos Kosmas]

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]

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.

[richardHaw]

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 I am going to do that on a Topcon or a Canon instead

[richardHaw]

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

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]

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]

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.