F stop: speed of the lens
Pick an f-stop that appears normal to the eye
on zoom lenses, the apurture changes as you zoom.. your image gets darker. That's a problem (as you well know)
f2 has a shallower depth of field than f22
The aperture effects EXPOSURE, the relative brightness or darkness of the image. Other factors are the sensitivity of the image sensor (ISO), and the shutter speed.
Factors for balancing for a proper exposure.
F/stop
Shutter Speed
ISO
Practice: Shoot in AV mode, so you can change the aperture, but the exposure is maintained.
Watch TV/Movies
- determine whether they used a wide angle lens or a telephoto lens
- are they using a shallow depth of field or long/deep depth of field.
