Focus and Depth of Field

Bokeh

Blur or Quality of Blur (appears differently with different lenses)

Diopter

a small dial or knob adjuster connected to the viewfinder.

Depth of Field

The zone in your photo that has acceptable sharpness or focus. aperture(larger aperture = shallow DoF and a smaller aperture = deeper DoF), distance from subject (a closer subject to the camera, the shallower depth of field), and focal length (a more telephoto lens = shallower depth of field) all affect depth of field. #'shallow'

Viewfinder Focus

hat the photographer looks through to compose, and, in many cases, to focus the picture.

Shooting Fast Objects Tips

#auto f-stop & auto ISO (shutter at 1/500) freeze subject frame #blurry background but frozen subject, shutter priority (F1/16, 1/60, ISO 200)

Auto Focus Mode tips

#half-pressing the shutter release button will start the autofocus process. #in most cameras, you can choose to use the point in the center of the frame to pick focus. #in many cameras, you can choose to focus on each side or a specific point #modern cameras have face detection to determine focus

Focus Tips

#recommend using autofocus in most situations nowadays. #set-up shots are better for manual when you have time. #in low light situations you might need to use manual focus. #get a sharp focus on a persons' eyes when shooting people. #increase your f-stop to make it easier to get in focus (good for landscapes)

Shallow Depth of Field

'shallow' depth of field has s small zone in focus

Deep Depth of Field

A 'deep' depth of field has a large zone in focus

Auto Focus Modes

Camera programatically focuses on certain points in a frame.

Continuous or servo mode

The camera constantly adjust to try to focus on the subject

One shot mode (AI-S mode)

The camera locks focus upon the half-shutter press, and stays focused to that distance.

Focus

The position at which rays of light from a lens converge to form a clear and sharply defined image on a focal plane.