Originally posted by Johnny Rod Been back to this no end of times! So in TTL using M mode, if I close the aperture down by say 2 stops, does the flash output increase to match? (hence your comment about using shutter speed to control ambient light) The rest I think I understand now - basically the camera uses the flash as the main light source in pretty well all situations where you ask it to automate something.
In TTL mode, the camera will try and expose the film properly with the flash.
What happens due to the ambient light is up to you...
I often would expose two stops or so dark with mine, then let the flash do the rest. It worked a treat...
You can still do that with a modern P-TTL system, but I felt the old way was more reliable. Though maybe that came from not being able to see the results right away 😜
--Eric