Sounava
In the zone
Oh ok then.That was a random image from google to highlight the grid lines.
You can set the lowest shutter speed beyond which the camera will not go in Aperture priority mode. Also, while in aperture priority mode, if you see that the camera is showing the Shutter Speed as "Low" you can increase the ISO in that case.Aperture priority mode can lead to low shutter release and hence blurred images. ISO to compensate lower shutter speed.
Why not shutter priority mode, the only drawback will be shallow depth of field. Not much of a problem.
Yeah exposure indicator is not always right.
Of course the names "Priority" comes from the fact of the priority of the user.
Scenario 1 - I am shooting landscape. So I want great depth of field. I am in broad daylight. So I will set ISO 100, and Aperture 16 (to get great DoF). Let the camera decide what will be the shutter speed because that does not matter in my case so long as the exposure is right. So I will use Aperture Priority mode.
Scenario 2 - I will be doing a panning shot. So I need shutter speed say 1/60. Depth of field does not matter so long as the subject is in focus. So let the camera decide the aperture. So I will use Shutter Priority mode.
Scenario 3 - I will shoot a normal portrait. The background needs to be blurred out. So my requirement is a large aperture. I do not bother about the shutter speed here. So I will use A mode.
Scenario 4 - I have lots of time at hand and I want to shoot a perfectly exposed shot. I have a requirement of a certain aperture but shutter speed can be anything because the subject is still. I use manual mode. Take a shot at the camera specified meter. See it is underexposed a bit. Again take another shot varying the shutter speed a bit. Like this...
So you will use A or S according to your priority. If you are not at all bothered about any of these you can use P mode too where you can cycle through different combinations of aperture and shutter speed so that the metering is at the neutral level.