F Stops and Shutter Speed Explaination

This image was taken with a low F Stop, that most likely being around 1.8. This gives the image a shallow depth of field. However, because more light is being allowed into the lens, the shutter speed must increase in order to keep the brightness of the image at a suitable standard. The fact that more light is being allowed into the lens but being captured at a faster rate means that the light that was in front is captured nicely, although the light that was behind is gradually captured in a worse quality, becoming blurry, thus, creating a shallow depth of field.

This is an example of a high F Stop (F 32). This allows less light into the lens but slows the shutter speed down so the light is captured slower. This means that everything in frame is in focus giving you Depth of Field.