Recently I got a Schneider 28mm Xenon lens with the Arri standard mount, and a PL adapter for attaching it to my camera.
But I'm very confused about something,
I see Cooke Kinetal lenses have the same structure, so I'm sure someone will have the right answer, either from experience with Kinetal or Xenon lenses.
Here is the issue:
the lens has two rings, one for the aperture, and another for focus. The whole thing makes sense if you somehow attach it to the rear end (which is obviously not how this lens is attached). In that case turning the first ring changes the aperture while all other parts of the lens are fixed, and turning the second ring turns the cylinder body of the middle part of the lens, thus changing focus.
if you attach the lens where it's supposed to be attached: on the barrel with a little chanel where the screws fall into. Then you have a funny situation: the second ring can't be turned at all, because its connected to the middle cylinder and thus to the mount screws. Turning the aperture ring then changes the focus, and you can't change the aperture because you can't fix the inner part from rotating with it.
And I missing something here?
I know that the situation might be different when using the PL mount adapter, but I'm scratching my head thinking how on earth did they use these lenses even on cameras that have standard arri mounts, because no matter where you use it, it seems the screws have to be fixed to the middle rotating part.