Some 20 years ago I picked up an early NKJ Nikkor-SC 5cm F1.4 in Leica Mount, and a first-batch Nikkor-SC 5cm F1.4 in S-Mount. The latter- $30 with a Nikon M-Sync. The problem, someone had crushed the filter ring to make it take 40.5mm filters. I straightened it out and attached a Series VI adapter to it, works well. I picked up a front group from a later lens, and discovered the diameter of the fixture and optics was larger than the early lens. Collect enough lenses of one type made through their run- I believe the switch-over took place much later than the change to NKJ from NKT marked lenses.
A few months ago I picked up an S-Mount NKT 5cm F1.4, and this week picked up an NKJ 5m F1.4 in LTM. And again- the filter ring was a mess. Glass is good.
Shown with the later front group that I know to be incompatible.









What I decided to do: swap the glass between the LTM and S-Mount Nikkor. I have way more S-Mount lenses.
The LTM lens was $150 due to the filter ring being dented and the aperture ring being difficult to turn. All Better Now.
The NKT lens- $80 for parts. "Better than described", cleaned up beautifully when I got it. Had internal haze.
A few months ago I picked up an S-Mount NKT 5cm F1.4, and this week picked up an NKJ 5m F1.4 in LTM. And again- the filter ring was a mess. Glass is good.
Shown with the later front group that I know to be incompatible.









What I decided to do: swap the glass between the LTM and S-Mount Nikkor. I have way more S-Mount lenses.
The LTM lens was $150 due to the filter ring being dented and the aperture ring being difficult to turn. All Better Now.
The NKT lens- $80 for parts. "Better than described", cleaned up beautifully when I got it. Had internal haze.
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