Today, when I started using my camera outdoor this morning, I noticed that every other frame was a tad darker. Like, maybe a stop darker. Same settings. I had a studio session this afternoon and I noticed that every other frame I had the black line on it as if it were a shutter speed too high for the sync. Of course, I immediately checked what my shutter speed was, but it was correct. This happened every other frame through my entire session. I am using a new lens, so I decided I would check and make sure it wasn’t the lens but it was doing it with my 50 as well. I cannot imagine what is causing this to happen or watt setting on my have inadvertently, bumped it to change something inside of my camera. Any ideas?