
Sony a7 IV
33 MP instead of 12.1 MP
Sony · Mirrorless · 12.1 MP · Full Frame · 4K video

Scores combine our editorial testing with published lab data.
General | |
|---|---|
About This CameraThe Sony FX3 is a compact mirrorless camera released in 2021. Weighing 640 grams and measuring about 13 centimetres across, it is light to carry and small enough to work into tight shooting spaces. Its feature set points towards moving-image work. The 12.1 megapixel full frame sensor keeps stills files modest, video tops out at 4K, and there is no viewfinder, so composition happens on the rear screen. Still photographers still get in-body stabilisation and the Sony E mount to draw on, though the modest resolution rewards careful framing rather than heavy cropping. | |
| Brand | Sony |
| Model | FX3 |
Released ⓘRefers to the year this camera was officially made available for sale. | 2021 |
Announcement date ⓘRefers to the date the manufacturer publicly announced the upcoming release and general specs of this camera. | February 23, 2021 |
| Camera type | |
| Camera size | 129.7 x 77.8 x 84.5 mm |
| Camera weight | 640 g |
Optics71/100 | |
About the OpticsStills come from a 12.1 megapixel full frame CMOS sensor paired with the Bionz XR processor. That resolution leaves little room for heavy cropping or very large prints, though smaller files go easier on cards and storage. Sensitivity runs from ISO 80 to 102400. The low base setting helps keep exposures in check in bright light, while the wide range gives you options when light falls. Autofocus offers 627 points for the system to work with, and the camera can shoot at up to 10 frames per second, a maximum figure rather than a sustained rate. Shutter speeds reach 1/8000 second, enough for fast subjects and for wide apertures in daylight. In-body stabilisation reduces camera shake, which helps handheld work at slower shutter speeds. The Sony E mount means existing E-mount lenses fit without adapters. | |
Megapixels ⓘThe higher the number of megapixels, the more detail the cameras sensor can capture. | 12.1 MP050 |
Image resolution ⓘImage resolution is measured in pixels and megapixels, width by height. The higher the number, the higher its resolution. | 4240 × 2832 |
Sensor type ⓘThe camera sensor captures light and records the image. Sensors vary in physical size, the number of pixels, and quality. | CMOS |
Sensor size ⓘThe sensor size contributes to the overall quality as well as the dynamic and tonal range a camera can capture. As a rule of thumb, the more surface there is to read the light, the more information it will capture. | 35.6 x 23.8 |
Sensor format ⓘRefers to the most commonly used sensor sizes. | |
Continuous shooting ⓘThe number of sequential frames per second the camera can write to the memory card when shooting in burst or continuous mode. | 10 fps045 |
Lens mount ⓘThe lens mount will tell you what type of lens range you can fit onto the camera body. Often the same camera company will have different lens ranges for different cameras. | Sony E |
Image processor ⓘThe image processor in the camera converts the information collected on the sensor for digital storage on the memory card. | Bionz XR |
Aspect ratio ⓘThe aspect ratio refers to the proportional difference between width and height. The most popular aspect ratios are 3:2 and 4:3. | |
Min ISO ⓘRefers to the lowest native (or 'base') ISO setting. Lower ISO are less sensitive to light but make a cleaner image. | 8030200 |
Max ISO ⓘRefers to the highest native (or 'base') ISO setting. Higher ISO is necessary for low-light situations or night photography, but higher ISOs often introduce grain or noise. | 1024003003280000 |
Min ISO (expanded) ⓘExpanded (or extended) ISO is a digitally enhanced feature available on some cameras. It allows you to push beyond the native ISO range if necessary. | 4030200 |
Max ISO (expanded) ⓘExpanded (or extended) ISO is a digitally enhanced feature available on some cameras. It allows you to push beyond the native ISO range if necessary. | 4096003003280000 |
Minimum shutter speed ⓘThe minimum shutter speed will tell you the longest exposure your camera can take without using an external accessory. | 3044080 |
Max shutter speed ⓘThe maximum shutter speed tells you the length inside 1 second the camera will capture. These can sometimes be extended with accessories such as extra external batteries. | 800080032000 |
Autofocus points ⓘAutofocus points show where the camera is focusing graphically as squares or brackets in Live View or on an electronic viewfinder. These points are also used for light meter readings. | 6270300 |
In-body stabilisation ⓘIn-body Stabilization means the camera has a certain technology embedded that counteracts camera shake. | |
Viewfinder type ⓘThe viewfinder type is either electronic or optical. Electronic viewfinders will have a small screen in the viewfinder. Optical viewfinders will use prisms and mirrors to look through the lens. | None |
| Viewfinder dots | N/A |
Video91/100 | |
About the VideoRecording tops out at 4K resolution, with frame rates available up to 120fps for slow motion footage. The peak resolution and peak frame rate are listed separately, so confirm which combinations you need before committing to a project. The in-body stabilisation carries over to handheld footage, cutting the shake you would otherwise see when shooting without a tripod or rig. That makes casual handheld filming more practical with a body this light. Footage records as MPEG-4, MOV, XAVC S, XAVC HS or XAVC S-I files, giving a choice of file types for different production needs. A timelapse function is built in, so interval sequences can be captured without an external trigger or intervalometer. | |
Video ⓘIndicates if this camera is capable of recording video. | |
Max video resolution ⓘThe best resolution this camera can capture video in. Modern cameras can capture up to 8K video. | |
Max video format ⓘVideo resolution measured by the greatest number of pixels possible in each frame, width by height. A higher resolution means more detail or clarity in your video. | 3840 x 2160 |
Max video frame rate ⓘHow many frames per second your video will capture. Most cameras have options for multiple frame rates, depending on the resolution you shoot in. For a general video, 24p or 30p is the standard, but more serious filmmakers may need a higher frame rate for creative effect. | 120 fps |
Timelapse built in ⓘA built in time-lapse mode will allow continuous shooting throughout a prolonged period of time to be compressed into a sped up video. | |
Video file format ⓘDifferent cameras can record in various video file formats. The File format you record in can impact how you edit and use the files. | MPEG-4, MOV, XAVC S, XAVC HS, XAVC S-1 |
Features83/100 | |
About the FeaturesFraming happens entirely on the 3-inch TFT LCD, since there is no viewfinder of any kind. The 1.44 million dot panel stays sharp for focus checking, touch input speeds up focus placement, and the screen flips out for waist-level or overhead shots. The body is weather sealed, which helps in dusty or damp conditions. Sealing is a layer of protection rather than a waterproof guarantee, so care is still needed in heavy rain. Wi-Fi and Bluetooth are built in for wireless connectivity. There is no GPS, so location tagging needs a separate device. Lighting relies on an external flash unit, since none is built in. | |
Builtin flash ⓘA built-in flash will often be positioned right above the lens. This will automatically pop up when you activate it. | No |
External flash ⓘExternal flashes are often connected through a hot shoe at the top of a camera, or a cable at the side of the camera. | |
GPS ⓘGPS features in a camera will include location metadata to each of your photographs. | No |
Weather sealing ⓘWeather sealing capabilities will give you more confidence when shooting in unfavourable conditions. | |
| Screen type | TFT LCD |
Touch screen ⓘTouchscreen allows you to change camera settings and access menus with a swipe of your finger, instead of using buttons. | |
| Screen size | 3" |
Screen dots ⓘScreen dots indicate the resolution of the LCD screen by including each sub pixel. | 14400001150001500000 |
Flip screen ⓘA flip screen (or articulating screen) is a second screen which can flip out from the side or top of the camera. This rotating screen allows you more freedom to take photos at different angles. | |
Live view ⓘLive View feature allows you to see a continuous live video of what is being seen through your lens. | |
Wi-Fi ⓘBuilt-in Wi-Fi allows you to connect your camera and share images wirelessly. | |
Bluetooth ⓘBluetooth capabilities allow you wireless control of your camera with other external devices. | |
Storage & Battery76/100 | |
About the Storage & BatteryThe twin card slots accept SD, SDHC and SDXC media at UHS-II speed plus CFexpress Type A cards. That lets you use fast media when the work demands it and keep a second card fitted in the body. The NP-FZ100 battery is rated at 600 shots, a useful baseline rather than a promise for every shoot, since real-world endurance varies with settings and use. Long days are safer with a charged spare in the bag. USB charging lets you top the battery up between shoots from a compatible USB source, which reduces the need to carry a dedicated charger on short trips. | |
| Memory card | SD / SDHC / SDXC (UHS-II compatible), CFexpress Type A |
| Dual memory card slots | |
| Battery type | NP-FZ100 |
Battery life ⓘApproximately how long this cameras battery will last measured by how many photographs you will be able to take. | 600 shots1505000 |
| USB charging | |

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