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Shooting Mode: Aperture Priority Options
photoling
Posted: Thursday, February 18, 2016 7:12:42 PM

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In this Aperture-priority mode, you set the desired aperture and the camera sets the shutter speed automatically to obtain the correct exposure suiting the subject brightness. You can control the shutter speed indirectly by changing the ISO.

Aperture-priority mode is great for shots in which you want to control the depth of field by selecting a particularly wide or narrow aperture setting, or want to select the ‘sweet spot’ of a lens – this is the aperture at which a lens delivers its best image quality, typically around f/8 to f/11. Aperture-priority mode is therefore well suited to portraiture and landscape shooting.

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Posted: Thursday, February 18, 2016 7:12:42 PM
photoling
Posted: Thursday, February 18, 2016 7:29:20 PM

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On most cameras, aperture-priority mode is marked “A” on the Mode dial:

nikond3200_mode_a.jpg 

On Canon's camera, aperture-priority mode is marked as "Av" (Aperture Value) on the Mode dial:

photoling
Posted: Thursday, February 18, 2016 7:45:02 PM

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Depth of field, along with composition, is a major factor in how you direct attention to what is important in your image. It is the controlling factor of how much area in your image is in focus.

If you want to isolate a subject from the background, such as when shooting a portrait, you can use a large aperture to keep the focus on your subject and make both the foreground and background blurry.

Figure 4.7 

If you want to keep the entire scene sharply focused, such as with a landscape scene, then using a small aperture will render the greatest depth of field possible.

Figure 4.8 

photoling
Posted: Wednesday, March 2, 2016 12:57:41 PM

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When shooting in Av mode, you should constantly check on the shutter speed your camera is deciding on and make sure it’s quick enough to get sharp images. If it’s too slow, you may first adjust the ISO setting up to get it quicker. If you have to push the ISO too far, then you have to consider changing the aperture if possible.

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