Sony Alpha 7R III + Sony FE 24-70mm f/4 ZA OSS Vario-Tessar T* vs Sony Alpha a9 + Sony FE 24-70mm F2.8 GM

Device is protected with extra seals to prevent failures due to any kind of weather.

Flip-out screens can be useful for tricky shots.

The focus motor moves the lens in order to autofocus. For system cameras, having a focus motor in the camera's body allows you to use a wide range of lenses, including lenses which do not have their own focus motor. For compact cameras, a focus motor is usually built-in.

With 100% coverage you can compose the image correctly when you capture the photo. With less than full coverage you may have to crop your photos afterwards to get them looking perfect.

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Dustproof/water-resistant at depth equal to or greater than 1 meter.

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An optical viewfinder (or OVF) allows the photographer to compose a shot while seeing exactly what the lens will capture. OVFs have no time lag and require no power - as opposed to electronic viewfinders, which can drain battery life. OVFs are also better in low light situations.

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With AF tracking, once you choose the subject and press the shutter release part way down, as the subject moves, the autofocus will follow it. No more out of focus shots.

The more focus points the more flexibility in picking which part of the scene to focus on. They also give the image sensor a better probability in identifying the right area of the scene to focus on in more automatic modes.

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The larger the sensor the more light the sensor captures yielding in better image quality.

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With a wider aperture the sensor can capture more light, helping to avoid blur by enabling a faster shutter speed. It also provides a shallow depth of field, allowing you to blur the background to focus attention on the subject.

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The zoom range is the ratio between the longest and shortest focal lengths. A higher zoom range means that the lens is more versatile.

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With a higher light sensitivity (ISO level), the sensor absorbs more light. This can be used to capture moving objects using a fast shutter speed, or to take images in low light without using a flash.

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The maximum resolution available for videos shot with the main camera. Although it may be possible to choose among other frame rates, those recordings usually have lower resolutions.

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A phase detection autofocus system is faster than a contrast detection autofocus system. Even when recording scenes with a lot of fast movements, the videos are sharp and clear.

When recording movies they stay focussed and sharp.

A timelapse shows a long passage of time sped up. A series of photographs taken from the same position over a long period is joined together to create a short video. It is great way to capture things like the setting sun, or clouds moving across the sky.

24p is a video format (24 frames per second) traditionally used in cinema. Nowadays, it is used to create film-like motion characteristics.

AVCHD (Advanced Video Coding High Definition) is a file-based format for the digital recording and playback of high-definition video. It's a standard popular among professional cameras and camcorders.

A stereo microphone allows to record audio files or movies in stereo without an external microphone.

A microphone port allows connecting external high-end or specialized microphones.

More microphones result in better sound quality and enable the device to filter out background noise.

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With a standard mini jack socket, you can use the device with most headphones.

Devices with stereo speakers deliver sound from independent channels on both left and right sides, creating a richer sound and a better experience.

Zoom microphones record high-quality audio and enable you to record sound from a distance. They can be useful for recording meetings, lectures, and presentations.

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CIPA is an independent, standard measurement that determines how many shots a camera can take before the battery dies.

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The battery is removable and can be replaced by the user if broken.

An indicator shows you when the device has low battery.

The battery can be recharged and used over again.

The manufacturer offers a branded wireless charging kit. To charge the device, you simply put it down on its charging base.

A device's overall image quality score considers: color depth, dynamic range and low light performance. Source: DxOMark.

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The maximum ISO at which the device still captures excellent quality images. Source: DxOMark.

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The better a device's color depth the more color nuances it can distinguish. Source: DxOMark.

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The better the dynamic range the system captures a wider number of values from dark to light leading to more details in low and highlights. Source: DxOMark.

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The device has a standard memory slot (such as an SD or micro SD card slot) so that you can either extend the internal storage with affordable memory modules or you can retrieve data, such as photographs, easily from a memory card.

The device can connect to WiFi.