What is colour A sensation caused by light in our eyes Cones and Rods What is light Particle Wave Rays Weve got our best scientists on it Light is a particle because It has mass and momentum REALLY SMALL ID: 420515
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Slide1
Light, lenses, and opticsSlide2
What is
colour
?
A sensation caused by light in our eyesSlide3
Cones and RodsSlide4
What is light?
Particle?
Wave?
RaysWe’ve got our best scientists on itSlide5
Light is a particle because…
It has mass and momentum (REALLY SMALL)
This is the “magic” behind photovoltaic panels
http://www.youtube.com/watch?v=
8gFwKytVw1oSlide6
Light is a wave because…
1800s – Thomas Young: Double-slit
experiementSlide7
Light is a wave because…
Electromagnetic radiation frequency Slide8
Light is a ray because…
It’s behavior ALSO works like that of a ray.
Reflection
RefractionSlide9
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 imageSlide10
Focal LengthSlide11
Camera LensesSlide12
Lens types
Telephoto
Wide- angle
ZoomPrime lensMacro lens
Fish-eye lensSlide13
Telephoto
Long focal length
Brings the subject closer
Used for
Sports
Wildlife
Focal length:
135 – 300mmSlide14
Telephoto – Mirror-telephotoSlide15
Wide-angle
Short focal length that takes in a wide view
Used for landscapes and interiors
Focal length about 21 – 35 mmSlide16
Zoom
Variable focal lengthSlide17
Prime lens
Fixed lens
Cannot change focal length
Better in low-lightMore DOF controlSlide18
Macro lens
Some lenses have a macro mode as wellSlide19
Fish-eye lens
A warped perspective
Magnify in center onlySlide20
Lens accessories
Extenders
Extension tubes
Close-up attachmentFiltersLens hoodSlide21
Extenders
Multiplies the zoom/telephoto of a lens
100mm becomes 200mm w/ a 2x extenderSlide22
Extension tubes
Increase magnification in macro photographySlide23
Close- up attachments
Magnifying glass attachment for lens.Slide24
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
spectrumSlide25
Lens hood
Used to prevent glareSlide26
Lens Maintenance
Dust/particles – soft brush and air
Oils – solvents and cleaning padsSlide27
Lens maintenance