Nauticam D850 Housing is smaller then the Nauticam Housing for Nikon Z72?!?

Depends on the diameter of the lens, the specs say that the F mount 14-24 is 98mm I would expect  it wouldn't go through.  The Z mount version says 89mm and I guess that one would fit.

The ID of the housing opening is as I understand it is 100mm and the walls and locking mechanism and bayonet will take up space so the ID will likely be something like 96mm or possibly a little less.  The limiting factor will be the locking mechanism inside the N100 extensions if they are used - N120 extensions won't be a problem.  I expect most other lenses will fit through.

The lenses that don't fit through an N100 port require installing the body without lens then the N100-N120 adapter/extensions, then the lens followed by an N120 port.  The lens are normally largest at the front so the lens mount end and zoom gear will fit through the smaller port.  So, it's possible but not as convenient but it only applies to a handful of lenses.

13 hours ago, ChrisRoss said:

Depends on the diameter of the lens, the specs say that the F mount 14-24 is 98mm I would expect  it wouldn't go through.  The Z mount version says 89mm and I guess that one would fit.

The ID of the housing opening is as I understand it is 100mm and the walls and locking mechanism and bayonet will take up space so the ID will likely be something like 96mm or possibly a little less.  The limiting factor will be the locking mechanism inside the N100 extensions if they are used - N120 extensions won't be a problem.  I expect most other lenses will fit through.

The lenses that don't fit through an N100 port require installing the body without lens then the N100-N120 adapter/extensions, then the lens followed by an N120 port.  The lens are normally largest at the front so the lens mount end and zoom gear will fit through the smaller port.  So, it's possible but not as convenient but it only applies to a handful of lenses.

Thanks for the Info Chris,

Found this website http://www.cameradecision.com and did some checking just now n glad to know my Nikkor 8-15 and 16-35 diameters are all less than 89mm. Fortunately all of the listed suggested wide-zoom lenses on nikon nauti port chart with /less wide than 16mm, the diameters are all less than 90mm.  All of the fisheyes (and apsc dx) lenses are smaller and should be ok too, with the Nikkor 8-15 being the largest vs tokina 10-17, sigma 15, and nikkor 16.    

As you suggested, seems like it applies to  some of the wide zoom nikon FF mount (FX) with FL between 12-15mm and has around 90mm+ that might be affected.

Thanks !