Think about what the actual difference is. Are your manual settings much brighter than what TTL gives you? You should be able to tell from how they look before you start post processing them. If the manual settings produce brighter photos out of the camera than the TTL ones do, but they're still acceptable (not overexposed), then just dial your flash to TTL + the amount that works to get you back to the brightness levels you'd set with manual.I can do it in manual, but using TTL, how do you eliminate under eye shadows. I have a Yongnuo 568 and a 60D.
Thanks for the great responses. All of my photos were turning out under exposed. I guess I just need to push the +/- button to get my exposure correct. I just assumed that in ttl, it would automatically expose the subject correctly, but apparently not.
The photographer shooting flash in manual in such situations needs to be able to take all of that into account when setting their flash manually for each shot, on the fly, in order to get "perfect" exposure for each shot. Some few can do that consistently. Most can't.