I started using my camera more a few months ago. We went out to Mũi Nginh Phong a few months ago, and I wanted to use manual mode on my camera. I took a few decent photos, but when I came back I saw that a lot of them were grainy. I realized that I set the ISO pretty high a long time ago and never thought to change it. After that, I set my camera ISO back to 100 and never changed it. This picture was the first photo where I chose to intentionally change the ISO.