Okay, my pea brain can't figure this out ... maybe someone with even just a walnut sized brain can help me out
So, yesterday I was about to shoot hand-held shots with my S2 and CS lenses in the studio using strobes. The Profoto AIR radio wouldn't trigger the D4-2400R pack with AIR receiver plugged into the pack's PC jack.
Thinking it may be the connection between the AIR transmitter and camera hot shoe, or the radio transmitter wasn't working ... I put it on the Sony A99 to check it. It wouldn't fire it either, and I subsequently realized if I turned on a Profoto D1-AIR mono, both cameras would trigger that strobe, so it is something to do with the D4 pack connection that I've yet to figure out ...
But that's just the back story leading up to the weird thing that I discovered!
With an EVF you see what you get ... so setting the camera to max focal plane sync speed on the A99, and stopping down to f/11 in a dark studio, results in a totally black viewfinder.
I mean you can't see anything what-so-ever. You go totally blind. Any sort of "camera in-hand" spontaneous shooting of models, or portrait subjects with studio strobes is impossible.
Tell me what a dunce I am, and show me the error of my ways ... please.
Because if this is true, that is a MAJOR drawback of EVF for Pro work ...