[LRflex] Maksutov-Cassegrain on R4

I've got a Russian KMZ (Soviet) made f:8 500mm MTO Maksutov-Cassegrain lens I 
thought I would put in front of my R4 just for kicks.  Yea, yea, I know about 
bokeh donuts and all that - this is for fun, not for serious.   I've got a M39 
to Leica R adaptor coming in from China as I write this.  This 1950's circa MTO 
is threaded for M39.  I'm not sure I'll get infinity focus - but, oh well, it's 
my only telephoto till I can afford something nice and Leitz. 

So... Here is my goofy question.  As the lens does not have f stops, I assume I 
use the camera in (m) manual mode and match up the speed with... f:8 - right?  
The lens comes with a neutral density filter I could use in place of smaller 
stops if needed.   Anybody ever done this before?

Rob
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