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Nikkor 24/2.8 Pre-AI: Fixing an Awful Squeal
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- Thread starter ic-racer
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Like many other Nikkor lenses, the rubber ring has to come off, then the front part of the focus ring has to be unscrewed. Sometimes there is a locking screw (not on this one) and some times it is very tight.
Once that ring is off, the locking screw for the 'nose' of the lens is visible and can be removed.
Once that ring is off, the locking screw for the 'nose' of the lens is visible and can be removed.
The main helicoid is well lubricated and was not disassembled.
However, the secondary helicoid (for the floating elements) was dry as a bone. No helicoid grease at all. This is where the awful sound was originating. After some helicoid grease this secondary helicoid was smooth and quiet.
In the picture the helicoid has been turned out one complete turn. It comes off after 1/4 more revolution, at the brown arrow. To re-assemble, start it at the brown arrow and turn 1 + 1/4 turns to align the scribe mark with the green arrow.
Someone may have been in this lens before because it has scribe marks on it already.
However, the secondary helicoid (for the floating elements) was dry as a bone. No helicoid grease at all. This is where the awful sound was originating. After some helicoid grease this secondary helicoid was smooth and quiet.
In the picture the helicoid has been turned out one complete turn. It comes off after 1/4 more revolution, at the brown arrow. To re-assemble, start it at the brown arrow and turn 1 + 1/4 turns to align the scribe mark with the green arrow.
Someone may have been in this lens before because it has scribe marks on it already.
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All fixed and ready to be used on all my pre-ai cameras. Works great in stop-down mode on my other cameras with the flip-up AI tab.
Otherwise it would take AI Conversion ring #22, which is hard to find. Anyway, I already have a 24mm/2.8 AI for the other cameras, though, it is a different optical formula.
Otherwise it would take AI Conversion ring #22, which is hard to find. Anyway, I already have a 24mm/2.8 AI for the other cameras, though, it is a different optical formula.
Last edited:
Follow up to this lens.
Scouring the internet I found an "Unknown" number AI conversion ring. It had the correct aperture scale as my 24/2.8 pre-AI lens, so I took a chance.
Turns out it indeed was #22, the correct ring for this lens!!
Scouring the internet I found an "Unknown" number AI conversion ring. It had the correct aperture scale as my 24/2.8 pre-AI lens, so I took a chance.
Turns out it indeed was #22, the correct ring for this lens!!
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