Hi! This is very rare cine-lens, lomo, made in USSR, It was modded to m4/3 system. m39 screw mount, but you can easily put it to m4/3 system via m39-m4/3 adapter. Flange focal distance is suitable with m4/3. This lens have apperture ring, but doesn't have focusing ring. Cute made baby lens)) katalk - andymind