Zeiss 50/4 fle lens...how do I use it ?

[grappa]

So I just bought this used Hasselblad Zeiss 50mm f4 lens with a floating lens element. I am OK with how to focus the lens using the front and rear rings. The instructions explain this clearly,but what are the two center rings for ?
The instructions completely ignore these two center rings.
I cannot seem to find any mention of these on the web even after much searching. Maybe because I do not even know what to call them.
The lens came in the original packing with what seems like all the papers...nothing on this subject.

 

[carstenw]

Do you mean the shutter speed and aperture rings? What camera are you using it on?

 

[MFnLF]

Here it is: