We consider a lower weight better because lighter devices are more comfortable to carry. A lower weight is also an advantage for home appliances, as it makes transportation easier, and for many other types of products.
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 afterward to get them looking perfect.
Canon EOS 70D + Canon EF-S 18-55mm f/3.5-5.6 IS STM
Canon EOS 77D + Canon EF-S 18-55mm f/4-5.6 IS STM
The device is dustproof and water-resistant. Water-resistant devices can resist the penetration of water, such as powerful water jets, but not being submerged into water.
Canon EOS 70D + Canon EF-S 18-55mm f/3.5-5.6 IS STM
Canon EOS 77D + Canon EF-S 18-55mm f/4-5.6 IS STM
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.
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.
The number of megapixels determines the resolution of the images captured with the main camera. A higher megapixel count means that the camera is capable of capturing more details. However, the megapixel count is not the only important element determining the quality of an image.
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.
Canon EOS 70D + Canon EF-S 18-55mm f/3.5-5.6 IS STM
Canon EOS 77D + Canon EF-S 18-55mm f/4-5.6 IS STM
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 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.
Canon EOS 70D + Canon EF-S 18-55mm f/3.5-5.6 IS STM
Canon EOS 77D + Canon EF-S 18-55mm f/4-5.6 IS STM
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.
Canon EOS 70D + Canon EF-S 18-55mm f/3.5-5.6 IS STM
Canon EOS 77D + Canon EF-S 18-55mm f/4-5.6 IS STM
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.
Canon EOS 70D + Canon EF-S 18-55mm f/3.5-5.6 IS STM
Canon EOS 77D + Canon EF-S 18-55mm f/4-5.6 IS STM
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.
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.
Canon EOS 70D + Canon EF-S 18-55mm f/3.5-5.6 IS STM
Canon EOS 77D + Canon EF-S 18-55mm f/4-5.6 IS STM
The device has a standard memory slot (such as an SD or micro SD card slot) that enables you to extend the built-in internal storage with affordable memory modules, or easily retrieve data, such as photographs, from the memory card.