Lecture 5 Flashcards Preview

Camera And Editing > Lecture 5 > Flashcards

Flashcards in Lecture 5 Deck (52)
Loading flashcards...
1

What is exposure for still photography and cinema?

recording images of subjects to photo (light) sensitive film or digital media via photo sensor through controlled exposure of the subjects to ambient or / and additional light.

2

What five main factors control and affect exposure in cinema?

Aperture
Shutter
ISO
Filters
Light

3

List the available light sources to consider when setting exposure?

Sunlight
Moonlight
Street lighting
Interior lighting
Car headlights
Electronic lighting
Candlelight and flame

4

What is available ambiance light?

Natural or synthetic light present in the scene location

5

Name two sources of natural light.

Sunlight
Moonlight

6

Explain the additional light source film lighting?

Film lighting -mains/battery powered lighting on stands/clamps

7

Explain the additional light source ‘practicals’

Lights in normal domestic/ commercial light fitting on ceilings/walls/table lamps etc

8

What are mixed light sources?

Natural light
Ambient synthetic light
Additional film lighting

9

Colour temperature

5,000 / 6,000 = daylight

As it goes down it gets warmer and as it goes up colder.

Measured in kelvin

Note that the colour of the day with impact the ambient light

10

What is the colour temperature of candle light?

1,850 -1,930 k

11

What is the colour temperature of electronic flash?

5,500 k

12

What is the colour temperature of blue sky, sunlight?

10,000 k

13

What is the colour temperature of early morning/evening?

3,500 k

14

What is the colour temp of sunrise/sunset?

2,000-3,000

15

Colour temperature of mid morning/afternoon?

4,500k

16

Colour temperature of late morning/early afternoon?

5,000k

17

Colour temperature of average noon?

5,300 - 5,500 k

18

Shade or cloud colour temperature is ...?

Anything between 6,000 - 8,000k depending on the clarity of the day

19

How do you set the white balance on a black magic camera?

Set from choosing from a list of kelvin settings such as 5600k

20

What is alternative method to establish a white balance?

In many video cameras it involves the use of a push-button control, along its white card/paper places between the main light source and the subject.

21

How can you manipulate manual white balance settings?

Deliberately creating a warmer (yellow/orange) or colder (blue) than reality can be done by using coloured card for the manual white balance set.

Blue card - warmer as camera tries to neutralise the tint and render it white.

Yellow/ orange - colder as the camera tried to neutralise and render is as white.

22

Shutter in terms of exposure for cinema

Is expressed in speed (normally approximately 50th second) or angle (normally 180•)

• = degrees

23

Why is recording moving images using shutter speed limited? List two reasons:

1. Restricted by the need to acquire a number of frames per second to produce ‘moving’ images. E.g 24/25 frames for cinema for tv
You can’t have a shutter below 30th second to get 24/25 frames per second.

2. Faster shutter speeds (over 2 x the frame rate/ f.p.s affect the impression of natural motion.
If light is reduced there will be A reduced amount of motion blur making it seem unrealistic.

24

What is the frame rate for natural movement?

24fps or 25fps

25

What is the rule to abide by when choosing shutter speed and keeping motion blur?

Choose a shutter speed twice the frame rate
So 25 FPS needs 50th second shutter speed = 180• shutter angle.

26

What is the effect of Setting a faster shutter speed or shutter angle?

The images sharper but the motion appears less smooth due to the lack of motion blur.
50th or 60th second are not normally used but can be interesting

27

At 180• shutter angle what is the shutter speed for 24 FPS

24 FPS is 1/48 sec

25 FPS is 1/50

28

At 90• for 24 FPS

24 FPS 1/96 sec

25 FPS 1/100

29

45• for 24 FPS

24 FPS 1/192 sec

25 FPS 1/200

30

22• for 24 FPS

24 FPS is 1/384 sec

25 FPS 1/400

This is where the standard aperture stops so choosing a faster speed/ angle requires exposure compensation such as opening aperture