Can Contax TLA 140 be used on Leica M (without TTL). I guess i have to put the switch to "M". Based on the guide number, i think the chart on the back tells me how far the flash can cover in M (which is the max power?). Then adjust the aperture accordingly to the distance. What I am not so sure is the M's low shutter speed of flash sync. it is only 1/50. Does it matter? The G1 is 1/100. or what if I use it on 1/200 camera that requires to set the flash on M. I don't have leica TTL camera. If i use contax TLA 140 on a leica with TTL, will i be able to set the flash to TTL? Or this TTL only works with Contax G cameras... Thanks.