In article <524454$8r2@news.esslink.com>, andywlms@esslink.com says...

>I'm using an F4s body, two SB-25 speedlights, off camera.
>The master is connected to the F4 with an SC-17 cord. The
>slave is connected to the master with an SC-19 sync cord.
>Nikon's literature says that the flashes should be operated in
>the 'M' manual mode. If I leave the master in TTL mode, it
>recognizes changes in film speed, focal length and f-stop.
>The slave knows none of these things and defaults to 100 ISO,
>24 mm and f 5.6. Is this the expected result? Is the master
>calculating flash exposure assuming it is the only flash? Do
>all the settings on the slave have to be manually set? Should
>I set the master manually as well? The literature I've read,
>including the SB-25 manual, Peterson's Nikon system handbook
>and the Nikon FAQ, do not clearly address these questions, at
>least to me. I admit I haven't shot any film to test this rig yet.

The instruction book, uh, is somewhat difficult to read, sometimes...
Put both flashes in front curtain sync., use whatever zoom settings
you want (for controling angle of coverage, and relative power),
defeat the auto-fill feature, and, for me, use the camera in
manual exposure mode (with flashes switched to TTL), to establish
the ambient exposure that you want to use. TTL fill-ratios are set
on the first flash. The ASA and aperture indicated on the second
flash don't mean anything. Flash shut-down will occur when sufficient
light has struck the film for the conditions that you have set up,
combining the output of the two flashes.
Hope This Helps