LIGHT, LENSES, AND OPTICS. What is colour? A sensation caused by light in our eyes.

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Presentation transcript:

LIGHT, LENSES, AND OPTICS

What is colour? A sensation caused by light in our eyes

Cones and Rods

What is light? Particle? Wave? Rays We’ve got our best scientists on it

Light is a particle because… It has mass and momentum (REALLY SMALL) This is the “magic” behind photovoltaic panels

Light is a wave because… 1800s – Thomas Young: Double-slit experiement

Light is a wave because… Electromagnetic radiation frequency

Light is a ray because… It’s behavior ALSO works like that of a ray. Reflection Refraction

What does this mean for photography? We get to talk physics in Mr. Levine’s class Photo-graphy – light drawings Control the light, control the image

Focal Length

Camera Lenses

Lens types Telephoto Wide- angle Zoom Prime lens Macro lens Fish-eye lens

Telephoto Long focal length Brings the subject closer Used for Sports Wildlife Focal length: 135 – 300mm

Telephoto – Mirror-telephoto

Wide-angle Short focal length that takes in a wide view Used for landscapes and interiors Focal length about 21 – 35 mm

Zoom Variable focal length

Prime lens Fixed lens Cannot change focal length Better in low-light More DOF control

Macro lens Some lenses have a macro mode as well

Fish-eye lens A warped perspective Magnify in center only

Lens accessories Extenders Extension tubes Close-up attachment Filters Lens hood

Extenders Multiplies the zoom/telephoto of a lens 100mm becomes 200mm w/ a 2x extender

Extension tubes Increase magnification in macro photography

Close- up attachments Magnifying glass attachment for lens.

Filters Filter out certain types of light Protects main lens Polarizer lens Gets rid of glare Only lets in light “waving” a certain way IR lens Filters out visible spectrum

Lens hood Used to prevent glare

Lens Maintenance Dust/particles – soft brush and air Oils – solvents and cleaning pads

Lens maintenance