Used with permission from Eric Thomas.

1. Lenses
•How do I choose a lens?

2. Focal Length
•Focal length effects the perspective and
angle of view.
•The greater the focal length number the
more “zoomed in” you are.
•The focal length of the lens is marked in
millimeters on the lens.

3. Focal Length

4. Perspective
•How far the foreground and background
appear to be separated from one other
•If objects appear in their normal size
relations, the perspective is considered
"normal“
http://www.usa.canon.com/app/html/EFLenses101/focal_length.html

5. 50mm rule
•Lenses with a focal length of approx.
50mm are called normal lenses because
they have normal perspective.
•A 100mm lens has 2x magnification of
normal viewing.
•A 24mm lens has a ½ magnification of
normal viewing.

6. Wide Angle
•A lens that has a small number focal
length, a loose perspective and a wider
angle of view than a normal lens

7. Telephoto
•A lens that makes a subject appear
larger than a normal lens does
•A telephoto lens has a longer focal
length, a compressed perspective and
narrower field of view than a normal lens

8. Zoom
A lens that you adjust the focal length
over a wide range of focal lengths

9. Optical vs. Digital Zoom
• Optical Zoom – This is a true zoom lens.
These lenses bring the subject or action
closer to you. Better image quality.
• Digital Zoom – This is in camera
processing. The camera enlarges the
image at the center of the frame. Image
Quality suffers.

10. Optical vs. Digital Zoom
• Optical Zoom – This is a true zoom lens.
These lenses bring the subject or action
closer to you. Better image quality.
• Digital Zoom – This is in camera
processing. The camera enlarges the
image at the center of the frame. Image
Quality suffers.