The Mode dial on the Canon 4000D or Rebel T100. Now we come to the mode that you're most likely
to use - at least initially. This is the scene intelligent auto mode. This is a
great preset mode because the camera controls everything in order to get the best exposure.
It works really well with the autofocus, and it will decide for you if you want the basic
autofocus, or the AI servo autofocus - which means that it follows the subject around and makes sure
it maintains the focus. It is the best mode to begin with because the camera will guarantee
that you get a good exposure for your pictures, so you can start off confident with your photography
knowing that you are going to get some decent pictures without having to worry too much about
the technicalities. As I mentioned earlier the preset modes control most of the basic settings,
the camera makes nearly all the decisions and you can see what options
you have by pressing the display button when you are in any of those preset modes.
You might be able to decide on the picture style or whether you want to shoot one shot or at a time
or multiple shots, but essentially there isn't a great deal beyond that that you can change.
So even basic functions like white balance and ISO are fixed in the preset modes. If you try
to change them you'll get this message. The four modes above the off switch are called
the semi-automatic modes and they finish up, in fact, with M which is entirely manual. These modes
give you a lot more control over the settings that affect the exposure of your pictures,
and if you look at them in more detail which we shall you can see that P - the program mode
for example - allows you to change a lot more than scenic intelligent automatic mode. Then
when we get onto the shutter speed priority and aperture priority, we can change even more.
However, until you get to M - manual mode - the camera will still choose the best exposure.
Once you are in manual mode you can make those decisions yourself
and that's when you can become really creative with your photography.
Let's have a look at the P mode first so P mode or program mode is really useful because it gives you
slightly more control over the pictures that you are taking. The camera will still control
exposure but P mode allows you to control the shutter speed and the aperture, for example.
If we look at the options in P mode on the LCD screen here, you can see that there are many
more options available and if I press the shutter button down slightly we can see the shutter speed
and aperture appear too. Then I can use the main dial to move those settings up and down.
Now as I said, this is not entirely manual
and as you will see as I rotate the main dial both the shutter speed and the aperture change
because the camera is using both of them to control the exposure. So if you change one,
the camera will change the other one to compensate. That is quite useful because you
may need a specific shutter speed or you may be looking for a specific depth of field which would
be controlled by the aperture. Program mode allows you that limited flexibility to give you the
best possible chance to take the picture you want whilst the camera still decides the best exposure.