How does the aperture setting affect photographs?

Question

When you're looking at digital cameras and the aperture rating goes from say 2.5 - 4.0, what does that actually mean? Hoes does one setting and the same picture 1 second later with a different value affect the result?

Answer 1

aperture is equivalent to the iris in your eye. It can contract or expand depending on how you set it.

The iris in your eye will contract so the pupil will reduce in size when you're in a bright space and expand if you're in a dimly lit room for example.

In camera aperture, you can adjust the setting for a similar degree - the f number is the indicator of how big the "pupil" is in your camera lens. The smaller the f-number, the bigger the "pupil" is. Usually, you adjust the f-number to small if you're in a dimly lit room, or to a larger number if you're in a bright outdoor.

The first effect you're going to notice is that with large aperture (small f number) there's a lot of light entering your camera and therefore the picture can be a lot brighter when compared to a smaller aperture (large f number).

Then there's the issue of depth of field - in small aperture, at certain point (especially when there's enough light) you can capture both the background and foreground of the picture in focus while on larger aperture, you can choose to focus the background and blur the foreground and vice versa.

The f2.5-f4.0 means that your lens have an aperture of f2.5 on the wide end and f4.0 on the tele end.

Answer 2

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Answer 3

Dodol is exactly right. Aperture change has a couple of effects. If your camera is on automatic, a smaller aperture (eg: f/2.5 > f/5.6) will cause your camera to chose a slower shutterspeed. If you get a larger aperture (eg: f/5.6 > f/2.5), your camera will chose a faster speed.

Consequence?
-With larger shutterspeeds you are less likely to have motion blur and your subject action will be frozen.
-With a slower shutterspeed, you need to be careful of camera motion and your subject may show movement blur in the final image.

Second and most important difference:
-With a smaller aperture, everything will be in relatively sharp focus. This matches what the huma EYE sees.
-With a larger aperture, only the subject you or the camera choses will be in sharp focus. The rest will be creatively out-of-focus. This si what the human MIND sees.

So, the bottomline is, when looking for a camera or lens, a higher aperture (eg: f/2.5) give you more flexibility and is considered better.

I hope you find this helpful

Answer 4

Aperture Rating

Answer 5

There are two main settings for any camera and, in the auto mode, the camera makes the choice for you. One is "aperture" and the other is "shutter speed". The first determines the size of the opening in the lens that will permit light to enter the camera and it is inversely proportional to "depth of field". The bigger the "F stop" the smaller the "opening" and the greater the depth. The Smaller the F stop #, the bigger the opening and the narrower the depth of field about the point of focus. The other is the speed (length of time the shutter is open) when the photo is taken. The two work together to accomplish a "correct" exposure. Slower shutter speeds are generally used in lower light levels and faster speeds to do "stop action" work. With digital cameras, an ISO of 100 is considered to give the best quality and so the F stop and shutter speed are automatically set by the camera (or by the photographer) to get a correct exposure for the ambient lighting of the subject matter at that ISO setting.

Answer 6

blurred Depth of field, what is in focus and what is not in focus. Lets say your subject is 16' away (outside, daylight) and you set that at f/2.5 and tha camera picks a shutter speed of .60sec. with an ISO of 100. Now for an example, everything from 14' to 18' will be in focus, so now you change that aperture to f/4 and now everything from 12' to 20' is in focus. Thus your shutter speed will change to something like 125 with the same 100 ISO setting.

Check out a Portrait of a wild animal (in the wild) and the foreground & background is out of focus/blurred, that is because a wide open aperture was used..like f/2. Now take a look at a Landscape photo and everything is sharp and in focus, maybe something like a f/16 was used for that shot.

I hope this helps and is easy to understand.

Answer 7

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Answer 8

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