Arri Standard and OCT18 Lenses on an Alexa XT

[M Joel W]

I'm looking to shoot something on an Alexa XT with Arri standard mount and OCT18 mount lenses.

C7 adapters and Raf camera both manufacture adapters for these mounts to convert them to PL:

https://rafcamera.com/adapter-oct-18-to-arri-pl

https://c7adapters.com/en/product/oct-18_-_pl_mount/84

Both mention they only work on older Alexas. The Mini, Amira, etc. don't work with them. Neither does the XT.

But the XT mount looks to be the same mount as the EV and Plus, which is why I'm confused. I haven't used an XT before, but it seems you can swap mounts with it the same as EV or Plus mounts. But the diagram in the XT manual shows it's only 12mm deep and the PL mount needs to be 19mm deep to fit those OCT18 adapters. This likely was a redesign having something to do with the internal ND system, but I don't think that's the issue. I am looking at the aftermarket Leitax and C7 PL mounts for the XT, which should accommodate the adapters, but this feels really convoluted. 

I think I'm missing something. What's the easiest way to use these lenses on an Alexa XT?

Edited September 27, 2020 by M Joel W