I posted a more detailed version of this in the Mirrorless subforum, but have gotten no answers.
Can anyone tell me what my Olympus OM-D E-M10 has a 2nd-C flash setting for S and M modes, but it doesn't offer the same for P or A modes?
In P or A, the only 2nd curtain sync option it offers is SLOW2 which gives VERY slow shutter speeds. In S or M, it has Fill-in Flash, which syncs to the 1st curtain, and 2nd-C which appears to work just the same but sync to the 2nd curtain.
In P and A it has Auto and Fill-in, which both sync to the 1st curtain, but no flash mode that works the same as Fill-in except to sync with the 2nd curtain.
Why is that?
I want to use A mode with Fill-in flash synced to the 2nd curtain and my camera doesn't seem to have a way to do that. My thought is to use A mode to control depth of field and 2nd curtain sync so that if a fish is swimming fast, it will have a trail behind instead of in front.
I'd also like to know why, when I use A mode and SLOW2, my camera is firing the flash twice. The manual seems to indicate it should only fire once, just before the 2nd curtain. It's easy to tell that it flashes twice when the shutter is open for 15 to 30 seconds.
Thanks in advance for any help.
ps. Yes, I know someone is going to say "just use M mode". Thanks, but that doesn't answer my questions. :-) If I'm trying to take pictures of sharks, there's a good chance I won't have the time to sort out good M settings (I think), so I want to take advantage of the "help" the camera will give me in A mode. Furthermore, I just want to understand the theory and why the camera doesn't have 2nd-C in A mode.
As I read your question, and then review the E-M10 manual, what you are really asking is "Why is the E-M10 designed to operate the way it does". And it is NOT designed to do what you are trying to accomplish. To do what you want to can only be done in S/M modes. In both of these modes, you set the shutter speed and the camera then knows what to do with the flash in relation to the curtain. In P/A modes, the camera is using the shutter speed adjustment, in combination with the aperture, to achieve a good image and is unable to tack a flash on the end of the activity (2nd curtain). There's just too many variables to manage. So the answer really is "just use M mode" or S. With experience, and it doesn't really take all that long, you will be able to 'guess' at an initial setting. Take a shot. Review the image. Make adjustments. The shark will more than likely still be there for another shot.