In short
Judge a camera phone by the size of its main sensor, whether it has a real telephoto camera with optical image stabilisation (OIS), and how its processing handles faces, night scenes and video, not by megapixels or lens count. A 200MP or 50MP sensor usually saves smaller, binned photos by default, and zoom beyond the telephoto’s optical step is digital. Before the return window closes, shoot the same scenes on every lens, in dim light and while walking, and check the results on a bigger screen.
Camera specs are the easiest part of a phone listing to inflate. “200MP” or “quad camera” on the box says little about how a birthday party under tube lights, or a video shot from a moving auto-rickshaw, will look. Here is what each spec measures, which lines are worth comparing, and how to test the camera yourself.
Jump to a section10 sections
- Megapixels, sensor size and pixel binning
- Aperture: what the f-number tells you
- Zoom: a real telephoto lens versus digital zoom
- Ultra-wide, macro and the “filler” camera problem
- Video: OIS, EIS, 4K/60 and the front camera
- Night mode and processing: what no spec sheet shows
- RAW and pro modes: useful only if you edit
- Hands-on checklist: test the camera before the return window closes
- Camera phone questions buyers ask
- Sources
Megapixels, sensor size and pixel binning
Megapixels count the pixels on the sensor. More pixels can record more detail in good light, but fitting more of them onto the same sensor makes each one smaller. Samsung’s page for its 200MP ISOCELL HP2 sensor notes that a smaller pixel absorbs fewer electrons, which is why that sensor merges neighbouring pixels as light drops.
This is pixel binning. Samsung says the HP2 can combine up to 16 pixels into one: groups of four give a 50MP image with 1.2µm pixels, and groups of sixteen give 12.5MP with 2.4µm pixels, which Samsung says means clearer low-light photos with less noise. The price is resolution, so a “200MP” phone normally saves a much smaller photo unless you pick its full-resolution mode. A footnote on Google’s Pixel tech specs page says the same: the megapixel figure describes the sensor, and photos taken with default settings may have a lower resolution.
The sensor’s physical size matters more. Brands write it as a fraction of an inch, and the smaller the number after the slash, the bigger the sensor. Google’s sheet for the Pixel 11 Pro Fold lists a 1/1.56-inch sensor for the main camera but a 1/3.4-inch sensor for the ultra-wide, a reminder that the extra cameras can have far smaller sensors and may struggle sooner as light fades.
Tip: When two phones have the same megapixel count, compare sensor size instead. If a listing leaves it out, check the brand’s global spec page, and if the brand doesn’t publish it anywhere, ask rather than assume the phones are equal.
Aperture: what the f-number tells you
Aperture is the opening that lets light through the lens, written as an f-number such as f/1.7. Nikon’s guide to aperture gives the rule: the lower the number, the larger the opening and the more light gets in. A wide aperture also gives a shallow depth of field, which softens the background behind a close subject.
Compare apertures camera by camera, because they can be far apart on one phone. The Pixel 11 Pro Fold’s main camera is listed at f/1.70 and its telephoto at f/3.1, so the zoom camera works with much less light. And don’t read the f-number alone: a bright aperture on a tiny sensor won’t automatically beat a slightly dimmer one on a bigger sensor.
Zoom: a real telephoto lens versus digital zoom
Samsung’s camera explainer for the Galaxy S25 series puts it plainly. Digital zoom crops the picture and upscales it, which can cost detail; optical zoom uses the lens to magnify the subject, so the image stays sharper. A phone has true optical zoom only at the step its telephoto camera was built for.
In-between labels muddy this. The same Samsung page separates real optical zoom from a 2x “optical quality” zoom that it credits to the main sensor. Google’s Pixel 11 Pro Fold sheet lists “5x optical zoom” on the telephoto, “optical quality” steps at 0.5x, 1x, 2x, 5x and 10x, and “Super Zoom up to 30x”, with a footnote that Super Zoom isn’t available for all cameras, apps or modes.
| What the listing says | What it usually means | What to check |
|---|---|---|
| “200MP” or “50MP” main camera | The sensor’s pixel count; default photos are often binned smaller | Sensor size, and the resolution photos actually save at |
| “3x” or “5x optical zoom”, “periscope telephoto” | A separate telephoto camera | Its own megapixels, sensor size and OIS |
| “2x optical quality” | A step produced by the main sensor, not a separate lens | Sharpness at that step only |
| “Up to 30x” or bigger | Digital or processed zoom beyond the optical step | Treat as a bonus, not a reason to buy |
| “2MP macro” or “2MP depth” | A low-resolution extra camera | Leave it out when comparing |
| “4K/60fps” | The top video mode | Which cameras offer it, and whether it is stabilised |
To spot a real telephoto, look for a separate camera line with its own megapixels and an “optical zoom” figure, ideally with OIS, as Google lists on its 5x telephoto.
Ultra-wide, macro and the “filler” camera problem
Extra lenses look impressive, but each camera has to earn its place. An ultra-wide is genuinely useful for group photos, buildings and small rooms; check its megapixels, sensor size and whether it has autofocus. Autofocus also decides how close-ups work: Google describes the Pixel ultra-wide as having auto-focus and “Macro Focus”, so close-ups come from that camera rather than a separate macro lens. Some phones instead add a low-resolution macro or depth camera, which pads the lens count but rarely improves everyday photos.
- A large main sensor with OIS
- A telephoto with its own optical zoom figure, if you zoom often
- An ultra-wide with autofocus
- Low-resolution macro or depth cameras
- “Up to” zoom figures with no telephoto behind them
Video: OIS, EIS, 4K/60 and the front camera
OIS physically moves the lens or sensor to counter hand movement, as Samsung’s explainer puts it. Android’s camera developer documentation adds that OIS uses mechanical parts, which allows longer exposures before shake shows, so it helps night photos too. Android also notes that not every device has OIS.
Electronic image stabilisation (EIS) is software. Android’s documentation describes it as warping frames to smooth motion between them and says it can change the crop region, so stronger electronic modes tend to trim the edges of the picture. Many phones use both; Google lists optical and electronic stabilisation on the Pixel 11 Pro Fold’s wide and telephoto cameras.
- Check that your video mode is stabilised. Android warns that a phone with video stabilisation may not stabilise every resolution and frame rate; the only combination it guarantees for recording apps is up to 1080p at 30fps. Google’s own sheet lists its “Active” stabilisation mode for 1080p only, while 4K gets other modes.
- Check which cameras get 4K/60. If a listing doesn’t say, record on each camera during your test and check the video details afterwards.
- Read the selfie camera’s video line. For reels, vlogs or video calls it matters as much as the rear camera. Google gives front-camera video its own row (4K at 30 or 60fps on the Pixel 11 Pro Fold); if a listing shows only rear video specs, ask.
Night mode and processing: what no spec sheet shows
Night modes capture several frames and merge them. Samsung describes its Night mode as combining multiple exposures, and Google’s Night Sight help page asks you to hold still for a few seconds during capture. Pixels switch Night Sight on automatically in low light in Photo and Portrait modes, though not with the flash on, and Google suggests a tripod or steady surface for astrophotography.
Processing then decides how bright the shadows look, how hard the phone sharpens, how skin tones come out and how it copes with a bright window behind a face. Phones with similar hardware can produce very different photos, and Samsung itself notes that low-light results vary with light, subject and shooting conditions. That is why your own test matters more than any number.
Warning: Don’t judge night photos on the phone’s own bright screen alone, which can make a noisy or smeared picture look clean. Zoom in to full size or view the file on a laptop, and check faces, signboard text and fine textures.
RAW and pro modes: useful only if you edit
A RAW file keeps more sensor data, giving you room to fix exposure and colour later. Android’s camera framework writes raw sensor data as DNG, which Google’s DngCreator documentation describes as a cross-platform format for sensor data with minimal pre-processing. Whether a phone’s own camera app offers RAW is up to the brand, so look in its Pro or Expert mode while you test.
On iPhone, Apple ProRAW works on iPhone 12 Pro and later Pro models running iOS 14.3 or later; switch it on under Settings → Camera → Formats, then tap RAW in the Camera app. Apple says ProRAW files are 10 to 12 times larger than HEIF or JPEG, use the DNG format, and can’t be used with Live Photos, Portrait mode or video. If you edit in RAW, budget for more storage.
Hands-on checklist: test the camera before the return window closes
Use a display unit in a store, or your new phone in the first days after delivery. Read the seller’s return or replacement policy first, because time limits and conditions differ. Buying second-hand? Start with our used phone checks, then come back to these tests.
- Tap every zoom button (0.5x, 1x, 2x, 5x and so on), then pinch slowly from widest to longest. A sudden jump in colour or framing usually means the phone switched cameras.
- Shoot the same daylight scene on each camera and compare colour and sharpness. A big drop from the main camera shows where corners were cut.
- Take a photo in a dim corner or after sunset without flash, holding still. Look for smearing on faces and text.
- Photograph a person against a bright window, then something moving, such as a child, a pet or traffic, to check exposure, shutter delay and motion blur.
- Record 30 seconds of walking video in your usual mode, such as 4K at 60fps, then in the steadiest stabilisation mode. Compare shake, cropping and whether resolution dropped.
- Record front-camera video indoors under tube lights and outdoors, and make a short video call.
- Check the saved resolution in the gallery’s photo details, copy a few files to a laptop to view at full size, and note how much storage a minute of 4K takes.
- If something is clearly wrong, such as a camera that won’t focus, a spot on a lens or shaky video from a camera listed with OIS, raise a return or replacement request within the window and keep your sample files as evidence.
Tip: Take the same test shots on your current phone. Side by side, you’ll see whether the upgrade is real for the photos you actually take.
Our take
Pay for a large main sensor with OIS, a real telephoto if you zoom often, and stabilised video in the mode you use. Ignore lens counts and “up to” zoom figures, and let your own test settle the rest.
Camera phone questions buyers ask
Is a 200MP camera better than a 50MP one?
Not automatically. High-resolution sensors usually bin pixels and save smaller photos by default; Samsung’s HP2 page shows a 200MP sensor working as a 50MP or 12.5MP sensor that way. Sensor size, stabilisation and processing tell you more.
How can I tell whether a phone has a real telephoto lens?
Look for a separate camera in the spec list with its own megapixels and an “optical zoom” figure such as 3x or 5x. “Optical quality zoom” or “up to 30x” on their own don’t confirm one.
Do I need OIS if the phone has EIS?
OIS helps photos as well as video, because it allows longer exposures before shake shows. EIS works in software and can crop the frame. Ideally the main camera has both, and the telephoto too if you zoom a lot.
Should I shoot in RAW?
Only if you plan to edit. RAW files hold more data but take far more space; Apple says ProRAW files are 10 to 12 times the size of HEIF or JPEG. For sharing on WhatsApp or Instagram, the normal photo mode is easier.
Sources
- Samsung Semiconductor: ISOCELL HP2 200MP image sensor and its pixel binning
- Pixel Phone Help: Pixel phone hardware tech specs
- Pixel Camera Help: taking photos in low light with Night Sight
- Samsung UK: Galaxy S25 camera specs explained (optical vs digital zoom, OIS, Night mode)
- Nikon USA: what aperture is and how f-numbers work
- Android Developers: CaptureRequest reference for optical and video stabilisation
- Android Developers: DngCreator reference for RAW (DNG) files
- Apple Support: About Apple ProRAW
