To work correctly with M7 automatically, the SF24D must be set to TTL.
The M7 shutter must be set to AUTO.
The flash tells the M7 the correct shutter speed and the M7 tells the flash the ASA of the film in the camera IF the DX film speed is set to anything differently than is in the camera, that is the film speed sent to the SF24D. The inner dial in the back of the M7 sets the film if in any position other thsn 0 alignment with the ASA compensation. The outer dial, compensation does nothing with the SF24D.
The ISO button on the flash simply shows you the ISO the M7 has told the flash and has no effect in TTL.
The middle button on the flash allows you to select an aperture and view the distance range for an aperture. It has no effect on the flash. You do not hav to set an aperture on the flash nor have any agreement between the SF 24D and M7 as to aperture.
The last button on the left with /P allows compensation to be set on the flash and will affect exposure.
So to summarize, for proper operation set the flash to TTL, the M7 to AUTO.
When you turn both ON, you should see the correct ASA displayed on the SF24D.
Do you have a manual for both your SF24D and M7.
Information on using the SF24D is contained in BOTH manuals.
It's a very simple system with the flash in TTL and M7 in AUTO.-Dick
BTW, the flash offers two additional modes, A, where the sensor on the flash determines exposure and M which is the traditional method. With the M7, these modes are not required.
Last edited by budrichard; 02-23-2013 at 12:45 PM. Click to view previous post history.