About light

2. Lights
 Light is very essence and the basic substance of
photography. It important to understand how light behaves
and how lenses form it into images in order to gain a
broader view of possibilities of photography.
 A stream of energy radiating away from the sun or similar
radiant source.
 Travel at a speed of 186,000 miles per second in the air.

3. CHARACTERISTICS OF LIGHT
 1. Reflection- deflection or bouncing back of light
when it hits the surface.

4.  2. Refraction- bending of light when hits a
flat, smooth and shiny surface

5. 3. Transmission

6. 4. Absorption
 Lights are absorbed by the medium

7. KINDS OF OBJECT AS TO HOW THEY BEHAVE
TO LIGHT
1. Transparent objects-allows sufficient visible light
to pass through them that the object on the
other side may be seen
2. Translucent objects- allows light to pass, however
diffuse it sufficiently that objects on the other
side may not be clearly distinguished.
3. Opaque objects- so greatly diffuse the light that
recognizing the object on the other side is very
difficult if not impossible

8. SOURCES OF LIGHT
1. Natural light
This refers to the day light
coming from the sun, which Is
generally utilized for outdoor
photography

9. Classification of Natural Light
1. Bright sunlight- objects in open space cast and a
deep and uniform shadow

10. Classification of Natural Light
2. Hazy sunlight- objects in open space cast a transparent
shadow. Dust, smoke or clouds obscure the clarity of
the sky.

11.  3. Dull sunlight- objects in open space cast
no shadow

12. 2. ARTIFICIAL LIGHT SOURCE
This refers to man-made
sources of light used or utilized
for indoor photography. It is
also utilized to align the hazy
or dull light in outdoor
photography.
(incandescent and fluorescent
light bulbs, electronic flashes
and studio strobes)

13. TYPES OF ACCESSORY FLASH UNITS
 Manual Flash – these units require you to figure out
the correct exposure for your shooting conditions.

14. TYPES OF ACCESSORY FLASH UNITS
 Automatic Flash – these flash units use automatic
sensors to control light output and duration based
on the distance from the camera to the subject.
When you set the aperture you want to use, the flash
will automatically calculate how much light is needed
to illuminate a specific distance range, such as 3 to 15
feet; the flash unit will have an electric eye that reads
the amount of light bouncing back from the subject.

15. TYPES OF ACCESSORY FLASH UNITS
 Dedicated Light Unit – they are made to work with
your camera in specific electronic means (hence the
name). They will do all the thinking of the
photographer: automatically setting the correct
shutter speed and aperture, and controlling the
exposure by regulating flash duration.

16. TYPES OF ACCESSORY FLASH UNITS
 Built-in Flash Unit – a flash unit
built into the camera
 Off-camera Flash – a flash unit
not mounted on the camera
Flash synchronization speed is a
shutter speed that can be used
when working with a flash unit
to obtain evenly lit results.

17.  FILM SPEED
 LIGHTING
 CONDITION
 Bright Sun
 Hazy Sun
 Dull Sun
 ISO 100
 1/125 f11
 f8
 f5.6
 ISO 200
 1/250 f11
 f8
 f5.6
 1/125 f16
 f11
 f8
 ISO 400
 1/500 f11
 f8
 f5.6
 1/250 f16
 f11
 F8
 1/125 f22
 f16
 f11
FILM SPEED LIGHTING CONDITION
Bright Sun Hazy Sun Dull Sun
ISO 100 1/125 f11 f8 f5.6
ISO 200 1/250 f11 f8 f5.6
1/125 f16 f11 f8
ISO 400 1/500 f11 f8 f5.6
1/250 f16 f11 F8
1/125 f22 f16 f11