Flange Focal Distance (FFD,Flange Back,Back Focus)

Mount	FFD
C C-Mount	17.526
E Sony E-mount	18
EF-M Canon EF-M	18
FZ Sony PMW-F3 mount	18
m43 Micro Four Thirds mount	19.25
NX Samsung	25.5
M Leica M mount	27.8
FT Four Thirds mount	38.67
FD Canon Manual FD mount	42
EF Canon EOS EF mount	44
EF-S Canon EOS EF-S mount	44
A Minolta/Sony A-mount	44.5
K Pentax K-mount	45.46
F Nikon F-mount	46.5
R Leica R-mount	47
B4 2/3 Broadcasting	48
PL Arri PL mount	52