06-03-12

Workshop One - Location       06-03-12

Belinda Pratten                          Week Four                                    Semester One

·         Exposure – total amount of light used to create an image

·         Controlled by Shutter Speed + Aperture Other factors are lighting conditions, subject matter, ISO, personal preference for the image.

·         How do you choose your exposure
In camera light meter
Hand held light meter
Experience
histogram
an in camera exposure meter is read through the les (TTL) it considers filters and light coming in through the lens’ light transmission

·         ISO

·         The higher the ISO the higher the light sensitivity

·         The lower the ISO the lower the light sensitivity

·         DIN European for ISO

·         ASA American for ISO

·         ISO International Standards Organisation (1987)

·         Film sensitivity is fixed

·         ISO 400 film is twice as light sensitive as ISO 200

·         ISO 400 requires half as much light to produce a given result compared to ISO 200

·         Why have different ISO?

·         Action shots should have an increased ISO to freeze movement

·         Still portraiture or commercial work should have a low ISO to obtain quality

·         Night time shots should use a high ISO to get most light

·         Digital Camera uses a sensor to convert light into an electronic signal

·         High ISO means more noise (grain when referring to film) due to image degradation

·         Always use the lowest ISO possible

·         In low light use a sow shutter speed and have a wide lens aperture

·         In high light use a fast shutter speed and have a smaller lens aperture

·         In camera exposure is reflected light matter

·         The inbuilt camera meter renders mid tones

·         The camera meter will under expose a light scene (whites)

·         The camera meter will over expose a dark scene (darks)

·         Camera meter Modes

·         Average – in camera exposure meter is evaluated on average

·         Evaluative – in camera exposure meter is based on data base

·         Centre - in camera exposure meter majority is centre measurement

·         Spot - in camera exposure meter majority of measurement is in a small spot

·         Modes

·         TV – shutter speed priority you choose shutter speed the rest is worked out by the in camera exposure meter

·         Program – camera chooses both aperture and shutter speed

·         AV – you choose aperture the rest is worked out by the in camera exposure meter

·         M – you choose all controls manually

·         All in camera meters try to render the scenes to a mid tone

·         Mid tone scene will turn out appropriately exposed

·         Dark scene will turn out over exposed

·         Light scene will turn out under exposed

·         To correct this you will have to over or under expose your shot by 1-2.5 stops

·         Midtones

·         in camera exposure meter renders midtones so

·         light skin - +1 stop

·         white paint - +1/1.5 stops

·         white snow - +2/2.5 stops

·         detailed shadows - -2 stops

·         Todays Task

·         Set your camera to shutter speed priority ISO 100 shutter speed 1/250 photograph;

o   White subject

o   Black subject

o   Average toned subject

o   Mixed subject of both black and whites

o   For each shot note the f. used

o   Change to manual and get some other shots

o   Upload photos and information about the exposures to your blog.

·         Complete 10 Questions

·          Next week no class

·         Side note: Check out Café press where you can make personalized bags, mugs ect

Task

This shot taken at f.7 at 1/250 and with a shutter speed of 100 is under exposed for the purpose of the exercise 

This shot taken at f.7 at 1/60 and with a shutter speed of 400 consisted of mostly blacks and i exposed it correctly for this exercise

This shot taken at f.7 at 1/60 and with a shutter speed of 400 consisted of mostly whites and i exposed it correctly for this exercise

This shot taken at f.5.6 at 1/100 and with a shutter speed of 100 consisted of mostly midtones and i exposed it correctly for this exercise 

The before and after of a shot i took today in civic

 A before and after of one of my street portraits taken today

 A before and after of another of my street portraits taken today

A before and after of another of my street portraits taken today