What Is a Mirrorless Camera, and Does a Beginner Need One?

What "mirrorless" means

A mirrorless camera is exactly what it sounds like: a camera without a mirror. The mirror it's missing is the one inside a DSLR (digital single lens reflex). In a DSLR, a mirror behind the lens reflects light up into an optical viewfinder, so you see the scene through the lens itself. When you press the shutter, the mirror flips up so the light can reach the sensor, the chip that records the picture.

A mirrorless camera does without it. Light falls on the sensor the whole time. The sensor feeds a live image to the rear screen, or to a small electronic viewfinder (EVF): a tiny screen you hold to your eye.

So the camera can show you the exposure you're about to get before you take the picture. Exposure is how light or dark the photo comes out. It can do that even in light too dim to see through an optical finder. And because nothing has to swing out of the way, it can fire faster bursts. With its electronic shutter, which has no moving parts, it can also shoot in complete silence.

How it differs from a DSLR

Size and weight. The mirror needs room to flip, so taking it out makes the body smaller and lighter. A full-frame DSLR with a 24-105mm lens is about a third heavier than its mirrorless equivalent, by Canon's own comparison. (Full frame is a sensor size, and there's more on it below.)

Autofocus. A DSLR focuses using a separate sensor with a fixed set of points. A mirrorless camera focuses with the imaging sensor itself, the one that takes the picture. So it can put a focus point anywhere in the frame. It can also recognise faces, eyes and animals, and follow them.

Video. With the sensor always live, video is something a mirrorless camera does naturally. You can frame a shot through the viewfinder, and the same subject tracking works while you record. A DSLR has to lift its mirror and use the rear screen to record at all.

Lens mounts. The mount is where the lens fixes to the body. With no mirror box, the lens can sit closer to the sensor. So mirrorless cameras use mounts designed without a mirror box: Canon's RF, Nikon's Z and Sony's E. Old DSLR lenses fit through an adapter.

Battery. An optical viewfinder uses no power, and an electronic one does. So a DSLR lasts longer per charge. Canon quotes 1,200 shots or more for a mid-range DSLR, against a few hundred for a mirrorless body.

Why the big makers stopped developing DSLRs

Because the market moved first. Mirrorless cameras overtook DSLRs in shipments in 2021. By 2025, more than 85 per cent of new interchangeable-lens cameras sold were mirrorless. (Interchangeable-lens just means you can change the lens.) Sony and Canon said in 2021 that they would release no new DSLRs. Nikon stopped developing them in 2022. Pentax is the only major maker that hasn't discontinued its DSLRs.

None of that makes a DSLR a bad camera. It makes it the last of its line.

What a phone can't do, and what it does better

Four things separate a camera from the phone in your pocket.

Sensor size. A phone's main sensor is usually quoted as between 1/2.55 and 1/1.3 of an inch. An APS-C camera sensor measures about 23.6 by 15.6 millimetres, and a full-frame one 36 by 24. A bigger sensor collects more light, and light is what suppresses noise, the grainy speckle in dim pictures. A 2018 phone sensor measures roughly three times worse for shot noise than an interchangeable-lens camera's.

Real optical zoom. A phone's zoom is mostly a crop. It cuts out the middle of the sensor, and no detail is gained. A camera lens zooms optically. And an interchangeable-lens body takes whatever lens you can carry. Reach, meaning how close a lens can bring a distant subject, is the one thing a phone can't fake.

Shallow depth of field. That's the blurred background in a portrait. It comes from a wide aperture (the lens opening) in front of a large sensor. A phone's portrait mode builds a depth map, working out how far away each part of the scene is. Then it blurs the background in software. A camera does it optically, in every frame.

RAW files. A RAW file is the sensor's unprocessed data. It holds 12 or 14 bits of tone per colour channel, rather than 8. And the white balance, which corrects for the colour of the light, is chosen afterwards rather than baked in. Phones can record RAW too: Apple's ProRAW, and DNG on Android. So the format isn't the difference. The difference is the information a large sensor puts into it.

What the phone does better is everything around the picture. It's always with you, and in daylight its results are hard to fault. If none of the four things above is your reason, the phone is the better camera.

The jargon that confuses beginners

Crop sensor versus full frame. "Full frame" means a sensor the size of a 35mm film frame: 36 by 24 millimetres. APS-C is smaller, and Micro Four Thirds smaller again. A smaller sensor is often called a crop sensor: with the same lens, it sees a cropped version of what full frame would.

The crop factor tells you how much. Multiply a lens's focal length (the millimetre figure) by it to get the full-frame equivalent. It's 1.5 on most APS-C cameras (1.6 on Canon's), and 2.0 on Micro Four Thirds. So a 50mm lens on an APS-C body frames like a 75mm on full frame. A smaller sensor costs less, weighs less and reaches further with the same lens. A larger one is cleaner in the dark, and blurs backgrounds more readily.

The kit lens. A kit is a body sold with a general-purpose zoom lens, typically a 16-50mm or 18-55mm. It's the lowest-cost lens you'll ever buy for the system, and it covers the everyday range adequately. So a first camera should normally be a kit.

The mount is the long-term commitment. Lenses outlast bodies by many years, so the mount is the decision that lasts. Each maker's mount is its own: Canon RF, Sony E, Nikon Z and Fujifilm X. Micro Four Thirds is different. It's an open standard that Olympus and Panasonic created in 2008, so that bodies and lenses from different makers fit each other.

Fujifilm X is APS-C only. Canon RF, Nikon Z and Sony E each carry APS-C and full-frame bodies, so a kit begun small can move up without starting again. And Sony's E-mount has the widest choice of lenses, new and second-hand.

What a beginner should look for

In-body stabilisation. Stabilisation counters the shake of your hands. Some bodies do it in the body, rather than relying on the lens, and that steadies every lens you fit. It matters most for handheld video, and for slow shutter speeds in dim rooms.
A screen that faces you. If you'll be filming yourself, you want a screen that swings out or flips to face forward.
A viewfinder, or not. Video-first bodies leave it out. It's the feature you miss on a bright day, when the rear screen is hard to see. And a camera braced against your eye is steadier than one at arm's length.
Battery life. Compare the shots-per-charge figures the maker publishes, and budget for a spare.
The second-hand market. The mount outlives the body. So a body on a current mount is a sensible first camera, even after a newer model has replaced it. It's not a dead end. Buy used from a business rather than a private seller, because the Consumer Rights Act 2015 covers goods sold by a trader.

How our picks fit

Our cameras list has seven picks, and not all of them are mirrorless.

For video, the Sony ZV-E10 with 16-50mm II lens is the video-first camera. It has an APS-C sensor on Sony's E-mount, and a fully articulating screen that swings out and turns to face you. There's face and eye autofocus and a microphone input, but no viewfinder at all. This listing is the kit with Sony's updated 16-50mm II lens, sold and dispatched by Amazon.

For photographs, the Sony Alpha 6400 with 16-50mm lens has the same size of sensor on the same mount. It adds the viewfinder the ZV-E10 lacks, and real-time eye autofocus for people and animals. Like the ZV-E10, it comes as a kit with a 16-50mm lens. It has no in-body stabilisation, so for handheld video you're relying on the lens.

The Nikon Z50 with 16-50mm VR lens is the equivalent way into Nikon's Z mount. It has an electronic viewfinder. Its kit lens has its own vibration reduction (Nikon's name for stabilisation), because the body has none. A newer model, the Z50 II, has replaced it. This listing is sold by a third-party seller, so check the returns terms.

The Olympus OM-D E-M10 Mark IV ticks the most beginner boxes at once. It has a viewfinder, in-body stabilisation and a lens included, and it's the smallest system on the list. The trade-off is its Micro Four Thirds sensor, which loses out to the APS-C bodies in poor light.

The Sony Alpha 7 III is the full-frame body. It has five-axis in-body stabilisation, and it's on the same E-mount as the two Sony APS-C cameras, so lenses can move across later. It's the most expensive body on the list by a wide margin, and the heaviest. That's a great deal of camera for a first one.

All seven picks are now mirrorless system cameras. The list used to carry two that weren't: the Canon EOS 250D, a DSLR kept for its optical viewfinder and the huge second-hand market in EF and EF-S lenses (Canon's DSLR mounts), and the OM SYSTEM Tough TG-7, a waterproof compact with a fixed lens. The 250D left when its listing stopped offering a new unit. The TG-7 left because a small sensor and a fixed lens put it behind every mirrorless body on the page at everything except surviving water. If snorkelling is the point, look at the action cameras list instead.

Is a mirrorless camera better than a DSLR?

For almost everyone buying new, yes. It's smaller, its autofocus finds an eye anywhere in the frame, and video is a first-class mode. It also uses the mounts the makers are still developing. A DSLR keeps an optical viewfinder with no lag and no battery cost. It has a much longer battery life, too, and a vast stock of used lenses. If those matter more to you, the Canon EOS 250D is on our list for exactly that reason.

Are mirrorless cameras good for beginners?

Yes. They're easier to learn on than a DSLR, for one reason above the others. The viewfinder shows you the exposure you're about to get, so you see a mistake before you press the shutter, not after. Add eye-detection autofocus and a kit lens, and the camera handles focus and exposure while you learn composition: what goes in the frame, and where.

Is a mirrorless camera better than an iPhone?

Each is better at different things. In daylight, for snapshots and clips you'll share straight away, a recent iPhone is the better tool, and it can shoot RAW. A mirrorless camera wins the moment you want real reach or clean pictures in poor light. It also wins if you want background blur that's optical rather than computed, or a lens you can change.