Question about f-stops and Variable diopters

[Henchman]

So, I will be shooting a ultra low budget in the new year, and a lot of it takes place in a hotel size room, that will be low light for the look of intimacy. 

 

Now, to get the widest Anamorphic setup, I have been experimenting.

My setup for the wide angle shots is going to be my gold Isco Ultrastar. Home made single focus VD using a 0.8 wide angle converter. And my 50mm f/ 1.4 super Takumar with an ef adapter on a 0.71 speedbooster. 

Correct me if I'm wrong on my calculations. 

This gives me the same FOV, but faster, as a 35mm f2 lens but without the speedbooster. Which is 28mm.

Correct?