Can someone explain Aperture Value on a digital camera for me? (in words i can understand)?
Posted on Apr 24, 2009 under Digital news and reports |I have a Canon Rebel
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I have a Canon Rebel
April 24th, 2009 at 7:19 am
The aperture is basically the hole in the lens which lets light in.
The smaller the number (f2.8) the larger the hole therefore more light
The larger the number (f22) the smaller the hole - less light.
There is a relationship between aperture and depth of field (the amount of sharp focus basically).
That is the smaller the number the smaller the area of focus.
For instance if you want a portrait with the subject in focus and the background blurred you would use a small aperture number.(f2.8)
if you want as much in focus as possible then use a large aperture number.(f22).
The other relationship is between aperture and shutter speed.
If you need a fast shutter speed then you will need to use a large aperture (small f number)
For instance if you want to freeze motion then you would need a fast shutter speed and probably need a large aperture to get the proper exposure.
i.e. for the exposure to be right you could use
f11 @ 1/30
to get a faster shutter speed setting of 1/125 you would need to have a aperture of f5.6.
That would give the same overall exposure but would help with freezing motion a bit more.
Hope that was not to complicated.
April 24th, 2009 at 7:19 am
Aperture value (Av) is a mode on the camera where you select the ISO and the aperture and the camera selects the shutter speed for you.
Shutter speed: how long the shutter is open. the longer the time (ie: 1/10) the brighter the photo, and the more motion that is shown. the shorter the time (ie:1/2000) the darker the photo, and the less motion that is shown.
ISO: The easiest way for me to explain this is to say that choosing your ISO is like choosing the light sensivity of your sensor. if your outside on a bright day, use an ISO of around 200… if you're inside use an ISO of 1600.
Aperture: How wide the lens actually opens up when you click the shutter button. This affects how much light enters the lens, and the dof (how much of the picture is in focus)/
to wrap this up…
Really bright situation (really sunny), you should use (approx.)… 1/2000 (fast shutter spreed), ISO 200 (small ISO value), f/5.6 (high f value). i'm not saying these are the settings to use, i just want you to understand how each one effect the pic…
in a dark situation… 1/100 (slow shutter speed), ISO 1600 (high ISO), f/1.8 (low/wide f value)…
i hope this is making sense…
so when you set your camera on av, you need to choose your ISO and f stop…
i usually choose ISO first, simply based on how much light there is where i am shooting…. so on a bright day i usually start out at about ISO 200…
then i choose the aperture… so if it;s really sunny out, you don't need to worry about how much light is entering the lens (becuase you have lots of light from the sun), so you should select you aperture based on how much depth of field you want (how much of the picture is in focus) (a small number (ie: 1.8) means that a small are is in focus, a high number (f/8) means that more area is in focus) (when i say area i mean distance from the lens. (so if i'm taking a pic of a person and i want just there eyes and ears in focus, but the background no, choose a smalled f-stop. if you're shooting a landscape and want lots of trees and stuff to be in focus, choose a higher f-stop…
so, i think that basically sums it up. you choose those two values, and the camera goes and chooses an acceptable shutter speed in order to create proper exposure (or whatever you have you exposure comp set to (that's a whole different topic))
April 24th, 2009 at 7:19 am
your CAMERA has nothing to do with aperture. It can select a suggested aperture, but the aperture itself is dictated by the LENS
an aperture is basically the size of the opening which allows light into the camera
when you press the shutter.
A Large aperture, or strangely enough a small number like f2.8 or f3.5 allows the MOST light into the camera body
a Small aperture, once again strangley, has a large number like f16 or f22
Large apertures are used when you want to focus on one thing and have the background blurred.
Small apertures are typically used when you want to have everything in your picture in crisp clear focus.
Right, like the last person suggests, APERTURE priority MODE on your CAMERA ALLOWS you to select the aperture on your LENS, and the CAMERA WILL DICTATE and appropriate shutter speed, based on your ISO setting to get the overall exposure correct.
There are three factors in determining exposure. The Aperture, or the size of the pinpoint hole in the shutter blades as they snap shut, the speed at which the shutter blades close, and your ISO setting, which determines how sensitive your film or sensor in a digital camera is to light.
The higher the ISO setting, the more sensitive to light. Therefore hihgh ISO settings are typically used in low light situations.
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