Mirrorless vs DSLR cameras: what's the difference?

When you think of professional photography, often a DSLR comes to mind. However, mirrorless cameras have become increasingly popular over the past decade.

The difference in image quality between the two is narrowing and technological advancements are pushing many in favour of mirrorless cameras rather than the traditional DSLRs. We've pulled out the key differences below and picked out the best in each camp, so read on for more analysis of the pros and cons of DSLRs versus mirrorless cameras.

Already know what type of camera you want? Head over to our full DSLR camera reviews and mirrorless camera reviews and use our filters to narrow down your choice

What are the main differences between DSLR and mirrorless cameras?

Digital single-lens reflex (DSLR) and mirrorless (often referred to as compact system) cameras are both interchangeable lens cameras, with features for more advanced photography. There are ranges of models available for each, from those aimed at entry-level photography enthusiasts to professionals.

Both cameras typically have big sensors, allowing them to let in more light and capture more detail than a standard digital camera.

A key difference between the two lies in way image previews are displayed:

While what you see through an electronic viewfinder (or on an LCD screen) is very similar to what you'd see through an optical monitor, there are some subtle differences, as we explain in more detail in our guide on optical vs electronic viewfinders.

Below, we've rounded up our pick of the DSLR and mirrorless cameras that have performed the best in our tests alongside some great-value models that are well worth a look if don't want to spend big.

Best DSLR cameras

Only logged-in Which? members can view our recommendations in the table below. If you’re not yet a member, you can get instant access by joining Which?

Models and prices last checked March 2021.

Best mirrorless cameras

Some of the models we've selected aren't recent launches, but they're still some of the highest performing cameras out there. You can check our camera reviews page for new reviews bimonthly. Models and prices last checked March 2021.

What are the pros and cons of DSLRs and mirrorless cameras?

Despite mirrorless cameras becoming more widely available and closer to DSLR cameras in quality, there are pros and cons to each type.

With an ‘old-school’ DSLR, there tend to be perks, which is most noticeably the superior speed when autofocusing or tracking subjects – although, this is changing.

Traditionally, DSLR cameras use ‘phase detection’ autofocus modules in the body of the camera, which make autofocusing and tracking subjects fast.

Mirrorless cameras rely on sensor-based autofocus, which analyses the maximum contrast between pixels on the camera’s sensor. When the contrast is highest, the subject is in focus. This method is traditionally slower and also tends to struggle with moving subjects, as it doesn’t involve measuring distance, just the level of contrast.

However, advancements in high-end cameras will see ‘hybrid’ autofocus systems featuring in the best mirrorless cameras, narrowing the gap between the autofocusing speeds of DSLR and mirrorless cameras.

If you prefer shooting via a traditional viewfinder and like to see a wide selection of accessories and lenses available, a DSLR is the way to go. If shooing via viewfinder, you can also be confident that autofocus is going to be at its very best.

If you need interchangeable lenses, but want something lighter and more compact, mirrorless is your best option. The gap between DSLR and mirrorless cameras is constantly closing, so you won't be compromising on picture quality.

Just bear in mind that older and entry-level mirrorless models can come with laggy viewfinders. Look for our viewfinder star ratings in our reviews to see if a mirrorless camera's technology is up to scratch.