Compact digital cameras have already appeared on the market offering zoom function at a time when compact analog cameras dominated the world of photography and lacked this functionality, just optical zoom. Users of the new cameras started using this zoom due to the ease of no longer needing to zoom in on something to make the photo, all they had to do was activate the new feature. The truth is that zooming works only for that: no longer having to approach something you want to photograph, however, there is a big difference between the image made with this feature and the image that the photographer took the trouble to zoom in on the shot, so it’s important to know when to zoom in and when to use the actual zoom.
Optical zoom can also be called real zoom and is the approximation that is made when moving the lens over the lens of the digital camera. This type of approximation does not affect the quality of the photograph because it is done in a way?Similar, which means that what will be printed on the image is the same as what the lens sees. When it comes to digital zoom, the story is different, as the camera takes part of the image and only increases that part, such as the zoom that occurs on the computer, resulting in the loss of some details of the image. In short, the camera sensor stretches the image. When purchasing a camera, for example, it is common for the customer to be impressed by reports that the computer has a 3x optical zoom and a 10x digital zoom. The important information, however, is optical zoom, which increases only three times. The ten digital times will spoil the quality of future photographs.
- The use of the zoom is directly related to the creation of the depth of field in the images and can even leave the photo flat.
- Without any notion of this depth.
- That is.
- It can give the appearance of everything that was represented in the image.
- Close and far.
- Same plan.
- This is because the difference between zoom and actual zoom is the angle of view of the camera lens and this angle decreases with the use of the zoom function.
- The numbers measured in? Mmm are focal lengths.
- Which is the ability of a lens to zoom in.
- Logically.
- The higher the number measured in “mm”.
- The greater the ability to get close to the target.
- A normal image.
- The same as that seen by the human eye.
- Is generated by digital SLR cameras with a focal length of 50 mm.
- The distance between the camera and the photographed object is represented by distances less than 50 mm.
- Zooming in on the scene is represented by longer focal lengths.
- Fisheye lenses.
- For example.
- Have a very short focal length.
- Thus creating the image distortion characteristic of photographic equipment.
When you go to photograph something and at the bottom of the scene in which this element is inserted there is another object, you will physically get close to what you want to photograph and you will take the image without using the zoom. In this way the distance between the two objects will be represented in a similar way to what we are actually seeing because, without the use of the zoom, there has been no change in angle. In the event that you cannot get close to what you want to highlight in the image and you need to use the zoom of your camera, your device will close the angle of view to be able to get closer to the highlighted object. In this way, the apparent distance between the two elements will be much smaller and it will appear that they are close to each other. When a small zoom is applied, this change is hardly noticeable, but depending on the intensity of the focus, the rendered image is completely different from the real image, especially if the distance between the photographed object and the objects in the background is large. We can cite a classic example: you are two meters from a person and he is 20 meters from an object in the background, for example. If you get closer to one meter, the distance between you and the person has been reduced by half, but the distance between the person and the background remains the same. But the zoom does not work that way if you take into account the closeness that the zoom offers, if you are in the same situation described above, that is, two meters from someone, and you use the function to maintain an apparent distance of one meter from the person, it cuts all distances in half, making the object below appear much larger than normal and that makes it appear much closer to the person. When zooming is the only alternative to render something, care must be taken if the image is not damaged due to perspective and apparent distances.