How to Shoot in Aperture Priority Mode on your DSLR

How to shoot in Aperture Priority with your DSLR camera to get better pictures!

If you want to take better photos of your kids, but haven’t yet managed to venture away from the Auto Mode on your camera, then this is the tutorial for you!

I’m going to teach you, step by step,  how to shoot in Aperture Priority Mode; which will help you get more control over how your images look, without going the full hog of shooting in manual mode. It’s a great first step toward learning how to take great photos, so let’s get cracking!

Before we start, let’s take a moment to understand what your camera is going to do on “Auto” and why we want to move away from it.

What’s Wrong with AUTO?

In AUTO, all your camera can do is have a look at the light available and try to come up with the correct exposure by balancing the three elements of exposure – aperture, shutter speed and ISO – for you. Although this sounds ideal, the problem with that is that the camera doesn’t know what you are trying to photograph or what you want the scene to look like, so it simply aims for a middle ground to try to cover any many situations as possible.  This is why you will often end up with photos that have that “middle of the road” look to them, since that is exactly what your camera is aiming for!  In order to get the images you hope for, you need to at least give the camera a nudge in the right direction.

Using Aperture Priority Mode

An easy way to start doing that is by using something called Aperture Priority Mode. In this semi-automatic mode, you tell the camera which Aperture and ISO setting to  use, and the camera works out the correct exposure by setting the remaining element,  Shutter Speed, for you.  Although you are only choosing two settings yourself, and the camera is still doing all the balancing for you, this gives you SO much more control than simply shooting in AUTO!

What is Aperture?

Before we get onto how to shoot in Aperture Priority Mode, we first need to have a quick lesson in what Aperture is, and what it does.

Aperture is basically an opening in your camera lens – a hole really – which lets light into the camera. When you change the aperture setting, you change the size of this opening, making it bigger or smaller. This is measured in something called F stops (such as F1.8 or F5.6 or F8) and the smaller the F-stop number, the bigger the Aperture. So for example, F5.6 is a smaller opening than F1.8.  (It does seem like it should be the other way around I know!)

As you would probably imagine, a bigger hole lets in more light; and a smaller hole, less light. This is useful to keep in mind because if you are shooting indoors where there is less light,  you might want to use a wider aperture (small F number) so you can make the most of the light available, and not have to resort to the dreaded pop up flash.

The other important bit to know about Aperture is that it also changes how our images look, by controlling something called ‘depth of field’. Depth of field is simply how much or how little of your scene will be in focus. Photographs with a large depth of field will have a larger area, from front to back, in focus, whilst images with a shallow depth of field will have a small area, again from front to back, in focus.

You can see this effect in the images below – the image taken with an aperture setting on F1.8 has a very blurry background, the one taken at F6.3 has some blurring in the background, whereas at F22, the entire background is also in focus – that’s depth of field in action!

You can use this to great effect, by blurring out parts of the scene you want to draw attention away from – for example a messy background; or by getting a slightly larger area in focus for a group shot, or having the whole scene from front to back in focus, for example when shooting a landscape.

To do this, simply remember that using a smaller F number will give you a smaller area in focus, and a larger F number will give you a larger area in focus.

What about ISO and Shutter Speed?

You cannot really talk about Aperture without also mentioning the other two elements of exposure, Shutter Speed and ISO.

Let’s start with ISO.  ISO is simply how sensitive your camera is to light. On a bright sunny day, you would use a low ISO to make your camera less sensitive to all that light, and on a dark overcast day, or indoors, you would use a high ISO to “boost” the light available.   ISO is written as a number from 100 to 6400 (or higher on some models) sometimes with “ISO” written in front of it.

Shutter Speed is how fast the shutters (think of them like curtains) over your aperture opens and closes. For now, what’s important to know about shutter speed is that it affects how motion is captured – too slow a shutter speed and you will get motion blur, where parts of the image are soft and unfocused (and not the areas you want!) so in most cases we want to make sure we have a high enough shutter speed to prevent this.  Shutter speed is a number, usually with a 1/ in front of it, so 1/125 or 1/800.

I know that all these different numbers are a bit confusing, but it does become easier with time, I promise! To help you with this I’ve created a little “cheat sheet” for you, which has all the information about Aperture, ISO and Shutter Speed on it, along with suggested numbers to use for each one, which will totally help you with this. You can download the cheat sheet here.

The very best way to learn how to shoot in Aperture Priority Mode is simply to go out and practice with it! Here’s what to do:

STEP ONE –  Change From Auto to Aperture Priority Mode

Set the dial at the top of your camera to A (Nikon) or AV (Canon) for Aperture Priority Mode, like in the images below.  (Goodbye little green box!)

STEP TWO – Set Your Aperture

Now you need to choose your Aperture number – the F stop. If you want a larger area of the scene to be in focus, for example if you were shooting a landscape, then you would choose a bigger F number, such af F9 or F16. If you want to get that yummy blurred background, say for a portrait shot, then choose a smaller F number, such as F2.8 or F4.5.

STEP THREE – Set the ISO

Now you need to set the ISO number.  As a general rule you can set this based on how much light there is in the scene you are trying to photograph.  On a bright sunny day choose a small number like ISO100 or ISO200, but indoors where there is less light or a dark overcast day, choose something like ISO800.

If you feel that setting both the aperture and the ISO is too much for you right now, don’t worry, you can set the ISO to AUTO, which means that the camera will balance both the ISO and the Shutter Speed for you, so you only need to worry about which one to choose. Although this does give you less control, it might be a great starting point until you get comfortable choosing both.

STEP FOUR – Check your shutter speed

Your camera will then balance the exposure for you by setting the Shutter Speed for you. Try to make sure that your shutter speed never falls below 1/100 (otherwise you risk getting blurry, out of focus images) if it does, change your ISO to a higher number, or choose a smaller aperture number.

STEP FIVE – Take your Picture!

Half depress your finger on the shutter to set focus, then depress fully to take your picture!

I hope you have enjoyed this tutorial. Don’t forget to pick up your cheat sheet which you can print out and refer to when shooting to make sure that you know which numbers to use and when!

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Audrey

Audrey Ann is a photographer who loves to find and capture the beauty in the chaos of everyday life. In her blog, Live Snap Love, she shares tips, tricks and tutorials that will help you improve your photography skills and beautifully capture the people and moments that make your days special

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