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Thanks for posting that. Yes, very easy to use those terms interchangeably.
I am surprised the working distance of the Mamiya 120 isn't a touch longer than the Canon 100mm macro. I would have guessed it focuses with a straight helicoid mechanism. I know the Canon moves elements around and the FL shortens.
Oh, here is the data straight from Sigi tech support on the 150 OS macro---may have posted this earlier.
"Thank you for contacting Sigma Corporation of America.
I contacted the corporate office for the information you are requesting.
Focal Length Working Distance
1:1 78.2mm Distance Scale: 0.45m: 256mm w/ hood, 190mm w/o hood
1:1.2 86.7mm Distance Scale: 0.5m: 306mm w/hood, 240mm w/o hood
1:1.5 96.1mm Distance Scale: 0.6m: 405mm w/ hood, 339mm w/o hood
1:2 107mm Distance Scale: 0.8m: 603mm w/hood, 536mm w/o hood
1:3 118mm Distance Scale: 1m: 801mm w/ hood, 735mm w/o hood
1:5 129mm Distance Scale: 1.3m: 1109mm w/ hood, 1042mm w/o hood
1:10 138mm Distance Scale: 3m: 2754mm w/ hood, 2688mm w/o hood
Infinity 150mm "