Yes, mine is the long petpet with a lens guard.
I can only use it with a Nikon RF.
Even when I mount it on a Contax, its focusing becomes stiff at certain point. So I gave up.
k san, as the lens need to be modified to mount on leica M. The accuracy of the metering depends on the work of the master. if the "pet pet" is thoroughly modified, it should give correct metering (i seemed to remember cham ching did some test on that back in hklfc). mine copy is a bit under about 1/3 stops, but never a big problem once you are used to it.