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Exposure Quiz (Answers)
Here are the answers to the quiz.
Question 1. To see how well you understand exposure, stops, EVs etc. try filling in the missing boxes (shaded in yellow). The top line is completely filled in so you get the idea.
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Exposure |
Before |
Changed by... |
Exposure |
After |
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Shutter |
Aperture |
|
Shutter |
Aperture |
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1/250 |
f/5.6 |
-1 EV |
1/125 |
f/11 |
|
1/60 |
f/8 |
+1 EV |
1/60 |
f/5.6 |
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1/500 |
f/2.8 |
-2 EV |
1/1000 |
f/4 |
|
1/125 |
f/4 |
increase 2 stops |
1/30 |
f/4 |
|
1/30 |
f/11 |
decrease 1 stop |
1/30 |
f/16 |
|
1/15 |
f/5.6 |
-3 EV |
1/60 |
f/8 |
|
1/250 |
f/11 |
0 EV (the same) |
1/1000 |
f/5.6 |
|
2 seconds |
f/16 |
+3 EV |
8 seconds |
f/11 |
Question 2. You take a picture in your camera's full auto mode and it picked the following settings: f/5.6 1/125. Your camera is set to ISO 200. You decide the camera has made the image darker than you like (underexposed) and you want to increase the exposure by 1 stop (+1EV). You put the camera into manual mode and decide to set it up yourself. What settings can you use to get the exposure you require?
Answer: To increase the exposure you need to have more light getting to the sensor. Therefore you can either increase the shutter speed by one stop (longer exposure), open up the aperture by one stop, or up the ISO to increase the sensitivity to light. Therefore the settings could be:
1/60 f/5.6 ISO 200
1/125 f/4.0 ISO 200
1/125 f/5.6 ISO 400
Question 3. You are in the hills and want to take a picture of your children with the mountains behind them. You put the camera into auto mode and it picks a setting of 1/250, f/4 at ISO 100. The picture is almost perfect - right exposure, kids perfectly in focus. The only thing wrong is that the mountains are slightly out of focus. What can you do before taking another picture to get the mountains in focus too?
Answer: You need to increase the depth of field to get the mountains AND the kids in focus. Therefore you need to close down the aperture to something like f/8 to f/16. As the exposure level is correct you want the equivalent exposure but with a smaller aperture. Therefore you could use:
1/60 f/8 at ISO 100
1/30 f/11 at ISO 100
1/15 f/16 at ISO 100
The problem here is that the shutter speed is now starting to get a little slow and camera shake may be introduced to the image. A tripod would prevent this but you might still get movement from the children (kids never sit still, right?)
So what you can do is increase the ISO. Therefore the following are also equivalent but give the smaller aperture you need while keeping the shutter speed at 1/60.
1/60 f/11 at ISO 200
1/60 f/16 at ISO 400
Question 4. Put these exposures in order starting with the one that will give the darkest image.
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a. |
1/250 f/2.8 ISO 400 |
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b. |
1/125 f/5.6 ISO 400 |
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c. |
1/60 f/2 ISO 200 |
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d. |
1/500 f/5.6 ISO 400 |
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e. |
1/125 f/4 ISO 800 |
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f. |
1/250 f/1.4 ISO 800 |
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g. |
1/250 f/4 ISO 50 |
Answer: The correct order is: d, g, b, a, e, c, f
If you got them all right then you've pretty much mastered exposures.
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Photographs
This is a site about photography so I'm sure you are expecting to see plenty of pictures.
For now, why not take a peek at the flickr galleries belonging to the two authors of this site.
Colin's Flickr Page
Phil's Flickr Page
"Photography as a fad is well-nigh on its last legs, thanks principally to the bicycle craze."
- Alfred Stieglitz
Printed in the American Annual of Photography, 1897.
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