1. You are shooting pictures of a football game. Your meter gives you a correct

Question

1. You are shooting pictures of a football game. Your meter gives you a correct exposure of 1/125 sec at f/5.6. What might be a better setting of shutter speed and aperture combination, if you want to stop the action? (Your lens has the following stops f/2, f/2.8, f/4, f/5.6, f/8, f/11, f/16 and the following speeds 1/15,1/30, 1/60, 1/125, 1/250, 1/500, 1/1000 sec) (5 points)

2. Explain what depth of field is and how you control it on a camera? Also give an example of when you might want a large depth of field. (10 points)

Thank you!

Explanation / Answer

1. In photography, the combination of shutter speed and aperture size is very vital as it controls the duration of exposure and amount of exposure of the recording medium/film respectively. In other words the product of these two is technically known as exposure. Now as per requirement of the situation, that is the need of the person behind the view finder, the settings can be manipulated to keep the exposure rating same, but we can freeze motion ( with higher shutter speed and a greater f number i.e increasing aperture eg. 1/2000 and f/2) or capture the flow of motion ( with slower shutter speed and lesser f number i.e decreasing aperture eg. 1/15 and f/16)

For the situation of freezing an event during a football match, the digital meter suggests for 1/125 at f/5.6 but this might not capture the frozen effect with 100% assurance, hence we need to increase the shutter speed. As previously suggested the product of these two settings is called the exposure, so its intuitively understood, for every up step of shutter speed we have to take a down step of aperture( f number) for instance if we go three step up i.e 1/125 to 1/1000 we have to go down three step on f scale, i.e f/5.6 to f/2. Thus with shutter speed at 1/1000 and aperture at f/2 you can convinently capture the frozen effect. ( Note the exposure is still constant and is equal to the product originally stated by the digital meter)

2. Control of Depth of field or DoF when understood properly can enhance a photographers ability to take quality photographs quatifically, a detailed explaination might take pages. A very basic definition, depth of field is the zone of sharpness within a photgraph that will appear in the focus. Every photograph has a portion of region infront ( foreground ) and behind (background) the subject that appears in the focus. This varies picture to picture as in smaller zone of focus( shallow DoF) a large zone of focus( deep DoF)

Factors that control Depth of Field

For Large depth of field. When a photographer wants a picture of a large lanscape, a deeper depth of field is beneficial as it sets a large portion of the forground and as well as the background within the zone of focus, ie. a larger portion of the photograph is in focus. eg lanscape photography, photographs of larger view of cites where many buildings are in focus, not only in the foreground but at the horizon too( background).

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