This follows up an earlier post. I have an M6 TTL and a monochrom. I read an earlier post that the sf40 flash supports TTL flash with the M6. I think it was Gus who posted this. We are off on a holiday soon (flybuys - with strict weight limits - so each gram matters - if I can do without taking the flash for the M6 and just rely on TTL for both the monochrom and the M6 with an sf40, that would be good. Advice sought. Regards, Arthur (apiarist1).