Photography is an incredibly popular hobby today. One of the most exciting developments in the last decade has been the development of new camera formats. Many people shoot with their smartphones, but sometimes a more traditional DSLR camera still has its advantages.

In this article, we aim to give you a thorough understanding of what is a DSLR. So that you can judge if a DSLR is the right camera for you.

Photo by Jan Vašek

What is a DSLR?

DSLR stands for  Digital Single Lens Reflex camera. Put simply, it’s a digital camera, with a single lens, containing a mirror and a prism within the body.

The mirror and prism bounce light from the lens into the viewfinder. This allows you to compose photos accurately and be as creative as you wish. 

How a DSLR camera works schematic
Light (yellow lines) through the lens bounce from mirror to the viewfinder. Allowing you to get an accurate view of the scene.

It’s easy to get bogged down in the technicalities of cameras. You may prefer to just get on with taking photos. But, if you want to understand how a DSLR works, do take a look at this video, which explains how a DSLR works.

Bigger Sensor Size Means Better Image Quality

A DSLR sensor is significantly larger than that in a compact camera so the pixels within the sensor can be larger and less densely packed.

The sensor in a Canon crop sensor DSLR will be around 22m in length. Now look at the size of the fingernail on your pinky – that’s the average size of the sensor in a compact or smartphone. Imagine 12 million pixels on both sizes of sensor and you’ll understand what I mean about pixel size and density!

A night photograph taken in a busy street in Tokyo using a DSLR camera at high ISO settings
A larger sensor will allow you to shoot at higher ISO settings. This image (shot at ISO 1600) would have looked much noisier if taken at the same settings on a compact camera. Image credits Yiran Ding

This makes DSLRs much better at gathering light, especially in dark conditions. You can raise your ISO setting much higher than on a compact camera without creating lots of noise (grain) in the pictures.

If you want to learn more about pixel size & density, have a look at this video from Ken Schultz.

Full Frame vs. Crop Sensor

DSLR cameras first appeared in the early 2000s. Digital sensor technology was still a fairly new technology, so full frame sensors would have made cameras prohibitively expensive. Instead, early DSLRs were fitted with smaller sensors, making them more affordable. The cost of technology has dropped over the last twenty years, yet there are crop sensor DSLRs on the market. This is because both formats have their advantages.

Related ArticleHistory of cameras

Illustration of the relative size of different camera sensors
An illustration of sensor sizes, from medium format down to the tiny sensors in smartphone and compact cameras

Crop Sensor Cameras

Crop-sensor cameras tend to be smaller and lighter, and the lenses for them have this same advantage. The smaller sensor also means lenses have a different field of view on these cameras. For instance, a 50mm lens used on a Canon crop camera will give an effective focal length of 80mm. This means you have greater reach – a real boon when photographing distant subjects, such as wildlife

To calculate the effective focal length of any lens on a crop sensor camera simply multiply the focal length by the crop factor, and that is 1.5 (on Nikon and Sony cameras) or 1.6 (on Canon cameras).

Full frame cameras

The larger sensor inside a full frame camera comes with definite advantages. A full frame sensor has larger pixels, for more efficient light gathering. This brings better image quality, especially when shooting in low light.

If you want to understand crop sensor DSLRs better, this video from The School of Photography, explains it well.   

How a DSLR Differs from a Compact Camera or Smartphone?

A DSLR has many advantages over smaller cameras, allowing you to unleash your creativity and take amazing photos! 

a top view of a DSLR camera's settings display screen.
On many compact cameras, you have to work through menus to changes settings. Dedicated control buttons make this process quicker and easier on a DSLR. Photo by Sharegrid

Let’s explore these advantages below.

Interchangeable Lenses

Firstly, using a DSLR gives you access to a vast range of lenses. Being able to change the lens allows you complete flexibility, enabling you to use the best lens for the subject you’re shooting.

A macro shot of a bee in a flower. taken using a DSLR macro lens.
The ability to change lenses meant I could use a macro lens to get really close to this bee

Lenses come in a huge variety of focal lengths, from super wide angle to telephoto behemoths. There are lenses to fit all budgets, from beginners to professionals. Lens technology has improved so much in the last 20 years that it’s almost impossible to buy a bad one now. This means that you won’t need to take out a second mortgage to get started! 

Don’t overlook lenses made by third party manufacturers like Sigma and Tamron either. Many of their offerings are just as good as those made by the big brands, and significantly cheaper too.

Better Ergonomics

I’ve lost count of the number of times my iPhone has almost slipped through my fingers when taking photos. By contrast, a DSLR has a large grip to hold onto, and carefully designed controls to help you quickly change camera settings. 

DSLRs also have large viewfinders to help you compose your pictures. The simple act of holding the camera to your face makes it more stable, and less prone to camera shake. Composing pictures via an LCD screen can be difficult in bright sunlight – a viewfinder removes this problem entirely.

a DSLR photographer looking through the viewfinder to compose a shot.
Using the viewfinder on a DSLR can help you make more stable shots. Photo by Omar Medina Films

DSLRs come in all sizes

If you’re worried about a DSLR being too big and heavy, there’s plenty of choices when it comes to size and weight. From the compact Canon 200D to the immense Nikon D5, there’s a DSLR that’ll fit anyone’s hands.

Side by side comparison photo of Canon 200D and Nikon D5
A size comparison between the Canon 200D and the Nikon D5
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