With the external bayonet (RF Nikkor)-Z adapter, time has come to the corresponding adapter for RF Nikkors without their own focusing helicoid. These are the 5cm f/1.4, f/1.5, and f/2 rangefinder normal lenses. In addition, there are two versions of the even faster, and vastly more expensive, 5cm f/1.1 Nikkor, one with and the other without helicoid, however I never was able to convince myself of the necessity to purchase one of them. Same goes for the 5cm f/3.5 RF Micro-Nikkor, by the way.
In connection with my previous fling with Sony E-mount/A7 series and the old rangefinder lenses, I had tracked down and finally obtained the Amadeo adapter with focusing helicoid that allowed use of the normal lenses. After a period of intense tinkering, I decided to combine the Amadeo with a factory spare Z mount. Further testing indicated I could achieve infinity focus with this combination, provided the Amadeo was trimmed a wee bit to fit inside the Z bayonet.
Here are the parts, and several RF normal Nikkors to show the variation in size between them. The '50s 5cm f1.4 models were tiny, whilst the newly designed 50mm f/1.4 from the revived Nikon S3 jubilee camera is much bigger albeit still small compare to DSLR items.
Just been taking some test pictures to verify the new adapter is operating properly. Now it is left to cure in the oven over night. Steam punk is serious fun....