Stop in for a cup of coffee

Sublime one said

I had to take a photography class for evidence gathering. Part of LEO training. The whole F stop thing boggled me! Hah!

Click to expand...

The higher the number the more closed the aperture is. It let's in less light like the pupils in your eye when you go out in bright sun. Taking pictures in low light without a flash? Open the aperture up to let more light in.