I bought a cheap FOTOFOX dumb Sony E to Nikon Z adapter for the Voigtlander 15/4.5 III. The adapter is slightly too thin (by about 0.1mm as measured with my digital caliper). By the lens equation, 0.1mm is the extension required for a 15mm lens to focus to 2.265m. Indeed, at f/4.5 infinity focus on my Z6 is achieved just slightly from the 2m mark. Unfortunately, the 15/4.5 Super Wide Heliar does seem to have floating elements, at least the rear group moves at a different rate than the front barrel. This means that I'm likely not getting all that this lens is capable of. Of course I have no way of checking whether the lens itself is within tolerance.
Does anyone know a Sony E to Nikon Z adapter that is dimensionally accurate?