Borbin the 🐱

To use a 50mm macro along with the PB-6 instead of the 18-70mm lens @70mm from Part 1 requires a smaller distance between the camera and the bellows mount.

For this, I made an even shorter F to Z mount adapter:

The left side with the F mount is 8.40mm in width, the depth of the recess with 58mm diameter is 1.5mm.
The right with the Z mount is 7mm in width and has the 58mm x 1.5mm indentation to connect to the F mount side.

This results in a flange distance of only 10.70mm, compared to the 16.40mm flange distance of the first version of the reduced mounting adapter. The unmodified original flange distance is 30.50mm.

With this shortened flange distance, the Sigma 50mm f/2.8 FX DG Macro works perfectly:

And so does the Nikon 50mm f/1.4, but it is not that sharp in the corners as the macro:

The Micro-Nikkor 55mm f/3.5 is in the same class as the Sigma macro in sharpness:

The Slide Copying Adapter bellows can be directly attached to the Micro-Nikkor. The Sigma requires either a 52mm extension tube or a step down ring 55-52mm with a BR-2 and BR-3 adapter: