You can keep record of photos capturing in different formats in digital cameras. At the time of writing, FullHD is the maximum format that an SLR camera can take. We are talking about a resolution of 1920 x 1080 pixels. In addition, you still have HD (1280 x 720 pixels) and most cameras can also film on VGA (640 x 480 pixels). These all has a reason, but now you probably want to film in FullHD. Filming in 4K (or UltraHD, which is approximately 3840 by 2160 pixels) is currently reserved for expensive compact cameras or very expensive professional cameras. At the moment the first DSLR’s come with the possibility to film in 4K, albeit a bit limited.
Small Talks on the Resolution
Realize that the resolutions that we show above is in the ratio of 16: 9. That is a different ratio than your camera makes to photos. The photos from your camera come out of the 4K digital camera in a ratio of 3: 2. In filming you get a little less image (or left and right more, above and below, but how you look at it of course).
Most cameras will show what you get in the picture on the back of the screen and automatically hide that piece of surplus compared to photos. But it is also something to keep in mind that you cannot film everything you see through the viewfinder. You understand that with a higher resolution also more data per image comes in. To circumvent that a bit, manufacturers have invented two things. Just the whole picture.
In case of a “progressive” image there is nothing special, you see everything. In the middle two images is an “interlaced” mode. The second image has the interrupting lines slightly different from the first. If you are going to show one after the other very quickly, those missing pieces will not fall like that. Taking these two very quickly in a row yields the last image. You obviously understand that you have to do it with multiple images per second. Otherwise it is no longer filming and that is also possible at different speeds. That is indicated in the number of images per second, or bps. So you have 25 fps or 30 fps. And there are also variants. In case of the 4K digital camera also the same kind of quality is used.