Task 2: Ten Questions

1. What are the two ways exposure is controlled? And what are some other factors that play a role in exposure?

Aperture and shutter speed.  Another factor can be changes in natural light. 

2. You have an ISO of 400, a shutter speed of 1/125^th second and an f-stop of F5.6.

a) I ask you to open up the aperture to let more light in by 2 stops. What would you change your reading to?

    
I would change the f stop to f2.8

b) Now, back at your original setting, close down three stops. What is your setting now?


I would change the f stop to f16

3. What are three ways you can measure exposure?


ISO, aperture and shutter speed.

4. If in a given situation ‘correct’ exposure is achieved by using 125 @ f8 at ISO 100, indicate the new shutter speeds required to provide ‘correct’ exposure for the other ISO settings below.

Film Shutter speed Lens aperture

ISO400 f8 1/500

ISO200 f8 1/250

ISO50 f8 1/60

ISO25 f8 1/30

5. If in a given situation ‘correct’ exposure is achieved by using 125 @ f8
at ISO 100, indicate the new f-number required to provide ‘correct’
exposure for the other ISO settings below.

Film Shutter speed Lens aperture

ISO400 125 f16

ISO200 125 f11

ISO50 125 f4

ISO25 125 f2.8

6. When you use a high ISO you get image degradation. With film this is called increasing the size of the grain. With digital we don’t refer to grain, we refer to …………………………………….


Digital Noise. 

7. On your camera, what is the difference between AUTO mode and MANUAL mode?


AUTO Mode - allowing the camera to choose the correct settings


MANUAL Mode - allowing the photographer to choose the settings for the amount of light to pass in order to capture an image. 

8. All in-camera meters try to render the scene as a mid-tone. So if the mid-toned scene is rendered appropriately, what will happen to the light toned scene (white)? And the dark toned scene (black)?


The whites will become darker and the blacks will become lighter, the camera aims for a mid tone. 

9. What type of metering do built-in camera meters use?


Evaluative 
Centre-weighted
Spot

10. If you are using ISO200 how more light sensitive will your exposure be if you change this to ISO400? (HINT: This is equivalent to 1 stop)


This will make the sensor twice as sensitive.