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)

please answer briefly，this is the practice of my physics exam.

Answer 1

Shutter speed : If you want to freeze the action, with no blur, without using a flash, you need to use a fast shutter speed. How fast? Giving a concrete answer is impossible, because there are a vast number of variables that are constantly changing and they have an impact on the result of the final image.

A few of these include: the light source, the speed of the moving subject, the subjects distance from the lens as it moves, the angle from which you are taking the photograph, and whether or not the subject has a reflective or absorbent surface.

Having said that, in respect of stop action photography, here are a few guidelines (in fractions of a second):

Wings of a humming bird: 1/2000 – 1/4000

Children playing soccer or football outdoors: 1/250 – 1/800

Children or pets posing for photos: 1/100 – 1/320

Velvety smooth waterfall: 1/10 – 1/50

Aperture size of lenses : As you increase the shutter speed, less light will reach the sensor. That means that you will need to open the aperture wider. This is where a “fast lens” comes in handy. It has a wider aperture (f/2.8 to f/1.8), which allows more light in when it is wide open, which in turn compensates for the faster, low light, shutter speeds.

So, u can use f/2 with 1/500 combination or f/2.8 with 1/250 combination of u want to stop the action.