back focus problem? with 16mm lens Zeiss MII

[Stefano Ceccon]

hi,
I bought a Zeiss 8mm MII PL for 16mm.
Wide for 2k 120 frames R1MX
I have a Allstar-mount, and some lens, zoom and prime.
The lens Zeiss 8mm does not focus to infinity, all other yes.
back focus problem? but only for one lens??
thanks for any help

 

[Stefano Ceccon]

I measured:
to infinity, focuses to 1.45 meters!!

 

[Jacek Zakowicz]

remove about 0.07-0.1mm shim from under the mount and it should get you pretty close.

 

[Stefano Ceccon]

thanks,
behind the lens?
an operation of precision
you do it?
what it costs?

 

[Jacek Zakowicz]

the shim should be under the stainless PL mount.
Just take out the screws and lift it.
you need a precise measuring tool to check the (shim) thickness- preferably a micrometer.