Aperture is how much a light want to hit your camera sensor. The Maximum aperture number measured in f-number for f-stop. For example, f1.8 to f22 depending on the lens. You will see some f-stop varies and it dependent of the lens.
Focus lengths is the distance from the lens to the sensors of the camera itself. Prime lens are lenses that lack the zoom function. Most prime lens are used to for portraits, a 50 mn and 85 mn lens are fix lenses. The focal length ranges of the lens is found on the camera body and sometime found next to an aperture number. Prime or Zoom lens have it benefit depending on what is the purpose of the lenses.
Click below to go back on the Homepage.