I'm new here and had a question about my Canon EOS 7D Mark II camera. I've been using it to photograph wildlife for a few months now, and it's given me some great results, but today something was off. Even though it was broad daylight, the pictures look like I took them at night! Did I accidentally flip a switch or push the wrong button and trigger this? Both today and yesterday, my camera was on the "Av" mode (there's no real reason for this, I'm still trying to figure out how the different modes work and Av was doing pretty well). Yesterday, though, my pictures were just fine! Here's a picture of my bookcase from my camera (it's really dark, so you'll have to increase your screen's brightness to see anything), and here's a photo of (at least roughly) the same spot, this time with my cellphone's camera. Is this an issue with my lens? Please help! I have no idea what's going on!
Update: The camera is working OK at this point, the pictures it takes seem to be a little dim but pretty much normal. The only think I'm consciously aware of that changed was that I took out my SD card and reinserted it, but that didn't seem to help earlier, so I'm pretty much at a loss. I'd still appreciate some help if possible though, so this doesn't happen again!