Everything that matters before you buy

A digital camera focuses light through a lens onto an image sensor, a grid of millions of light-sensitive pixels. A processor turns that signal into a photo and saves it to a memory card. You see the result straight away, can delete and retake, and can store thousands of shots on one card.

Most cameras sold today are mirrorless. Their sensor feeds a live electronic viewfinder, so what you see is what you get, including the exposure.

Social feeds are full of photos that look like they came from a 2000s point-and-shoot or a roll of film: soft highlights, grain, flash and shifted colour. Many people fake it on a phone with filter apps. The result rarely holds up, because the filter can't add detail or depth the tiny phone sensor never captured.

A real camera with good in-camera colour profiles gives you the look and the quality. Fujifilm calls them film simulations, Nikon has Picture Controls and downloadable recipes, Canon has Picture Styles, OM System has a colour dial and art filters, and the Lumix S9 loads custom LUTs.

Phones are brilliant for convenience and computational tricks. Dedicated cameras win on three things: sensor size, interchangeable lenses, and physical controls.

The bigger the sensor, the more light it collects for the same exposure. That means less noise in dim rooms, more dynamic range in bright skies, and natural background blur without software guessing at the edges. A full-frame sensor has roughly 12 times the area of a large phone sensor.

There are three main kinds. Mirrorless is now where almost all new development happens, but DSLRs from the last decade are still excellent buys used.

Spec sheets are long. These are the numbers that change the pictures you get, with interactive demos so you can see what they mean.

Focal length, in millimetres, sets how much of the scene you see. Shorter is wider, longer is more zoomed in. On smaller sensors the same lens looks more zoomed in, by the crop factor: ×1.5 on APS-C (×1.6 on Canon), ×2 on Micro Four Thirds.

Spending more buys real advantages, but they're specific. Here's where the extra money goes, what you'd notice in your pictures, and where the returns flatten off.

The body is only part of the cost. Every camera needs at least one spare battery and a card that's fast enough for how you shoot, and the right ones are often worth more than a small step up in body.

Work through these in order. Each decision narrows the field.

You're not only buying a body; you're joining a lens system you'll probably keep for years. Each brand has a personality: Canon for ease and colour, Nikon for handling, Sony for lens choice and autofocus, Fujifilm for style and film looks, Panasonic for video, OM System for small, tough kits, and Pentax for DSLR loyalists.

A first camera should make good pictures easy while letting you grow. Modern entry bodies track eyes and animals for you, so you can concentrate on framing. Spend on a better lens before a pricier body.

The best value is often a previous-generation body bought used. A Sony A7 III, Nikon Z6 or Canon RP costs less used than many new APS-C bodies and outperforms them in low light.

Sensor image quality improved slowly after about 2016. A five-to-ten-year-old camera can still produce prints that are hard to tell apart from today's. What has moved on is autofocus, video, stabilisation and speed. If you shoot landscapes, portraits, studio work or astro, an older body can be the smartest buy in this guide.

DSLRs are especially good value. Their optical viewfinders show the real scene with no lag, batteries last for well over a thousand shots, and used EF and F-mount lenses are far cheaper than their mirrorless equivalents. Both adapt to Canon RF and Nikon Z later with Canon's EF-EOS R adapter or Nikon's FTZ, so the glass isn't wasted when you upgrade.

If you want the look of film without the phone filters, pick a camera with good colour profiles built in. Fujifilm's film simulations are the reference; Nikon Picture Controls and recipes and OM System's colour dial do the same job straight out of camera.

For video you need stabilisation, a screen you can see from the front, a mic socket and a wide enough lens at arm's length. Overheating limits and audio matter more than megapixels.

Reach comes from your lens and from how many pixels land on the animal, not from the sensor alone. A crop sensor doesn't magnify anything: an APS-C or Micro Four Thirds body simply fills its frame with the centre of the image, so a smaller, cheaper lens gives the same framing. That's why crop bodies are the value route. A 45–50MP full-frame body cropped to the same framing still keeps about 20MP, and adds better low light at dawn and dusk, a cleaner viewfinder and faster stacked-sensor tracking, which is why professionals shoot full frame. Their real cost is the lens: 150–600mm-class zooms run £1,000–2,000, while 600mm f/4 and 400mm f/2.8 primes cost £10,000–14,000. Pre-capture, which buffers frames before you fully press the shutter, catches take-offs at every level.

Sports punishes slow sensors. A fast readout lets you use the silent electronic shutter at high frame rates without bent bats or skewed players. Full frame helps under floodlights.

Night skies need lots of light per pixel. A full-frame body at ISO 3200–6400 with a 14–20mm f/2.8 or faster lens is the classic Milky Way kit. A sturdy tripod matters as much as the camera.

Landscapes reward resolution and dynamic range for big prints and crops. Older high-resolution bodies are bargains here, because landscapes don't need fast autofocus.

Above £3,000 you're buying one of two things. Flagship full frame (Sony A1 II, Canon R5 Mark II, Nikon Z8) combines high resolution with stacked-sensor speed, so one body does sport, wildlife and landscapes. Medium format (Fujifilm GFX, Hasselblad) uses a sensor about 1.7× the area of full frame for smoother tonal gradation, more dynamic range and a distinctive shallow-focus look, at the cost of slower autofocus and bigger, pricier lenses. Leica sits apart: the M11 is a manual-focus rangefinder bought for the experience and the lenses.