What is the difference between mobile portrait mode and camera blur?
Nowadays, mobile phone multi-camera has become the mainstream trend. With the increase of cameras, especially the popularization of telephoto cameras, it seems that there has been a new change in the portrait photos taken by mobile phones. Especially with the iPhone as the representative, the portrait blur model is getting better and better. Compared with the camera, what are the differences between the mobile phone and the camera? Can mobile phone blur surpass the camera?
First of all, mobile phones have a certain blurring ability. But this blurring effect is minimal.
The core of blur is “shallow depth of field”. For depth of field, it is related to four factors: sensor size, lens focal length, shooting distance, and aperture size. The larger the sensor size, the longer the focal length, the closer the shooting distance, the larger the aperture, and the shallower the depth of field, the stronger the blur.
Therefore, the size of the mobile phone sensor itself is very small, so it is difficult to make it blur. Take the iPhone 11 Pro as an example, the sensor size is 1/2.55 inches, we can intuitively feel the difference between the mobile phone sensor and the camera through a picture.
More interestingly, when calculating the focal length here, It is not the equivalent focal length that everyone is familiar with. For example, the latest generation of iPhone 11 Pro, although the telephoto equivalent focal length is 52mm, the actual focal length is actually only 4.25mm. Therefore, if you want to take photos of your mobile phone directly, you want to have a blur effect, unless you are very close, otherwise you can hardly see the out-of-focus blur. For example, in the picture below, we used telephoto shooting, but the blur effect is almost invisible.
So how does the mobile phone realize the blur? Simply put, through the algorithm, the iPhone is the most ideal mobile phone for the blur effect, especially after upgrading to iOS 13, all mobile phones can use the aperture adjustment ability. We can take a photo, and then on the photo editing page, we can directly adjust the aperture size to simulate the blur effect.
Looking back at the camera, the blur ability of the camera is the source For the lens. We can use a large aperture with a telephoto lens to have a good blur effect.
For the camera, it is actually like this time The test content is the 90D with the 18-135mm set head as the test content. This combination already has a certain degree of blurring ability. But for the camera, we can use specialized portrait lenses, such as 50mm f/1.4, 85mm f/1.8, to get a better blur effect.
So what is the difference between a camera and a mobile phone? First of all, it is very important that the mobile phone’s ability to simulate blur is mainly to make the out-of-focus look more “virtual”. This kind of blurring cannot simulate the shape of the spot. The mobile phone algorithm can only make the out-of-focus point light source look more divergent, thereby simulating the shape of the out-of-focus spot. However, the visual effects of the light spot of the mobile phone and the light spot of the camera are essentially different. Therefore, the out-of-focus spot of the blurred photos taken by the camera is not available in the mobile phone.
Mobile portrait mode shooting
Camera shooting parameters: ISO 100, aperture f/5.6, focal length 1350mm, shutter speed 1/80s
Therefore, if we are shooting portraits, if we want better focus, we must Real bokeh effect with the help of camera lens. The out-of-focus shape taken by a mobile phone cannot simulate the bokeh out of focus of the camera.
I need to say more here, the blur of the camera , It’s not just the light spot. The camera shooting blur is entirely based on physical performance, that is, any object can be used to shoot blur, but mobile phones are different, and rely on algorithms. If it is said that the current algorithm has better processing power for the blur of the portrait, but for other objects, the processing failure often occurs.
such as the picture above, the mobile phone recognizes the subject Inaccurate, causing discrepancy in recognition. And the camera takes such photos, there is no problem. Moreover, as just said, the camera shooting can show a clear and beautiful outline of the light spot, which is more beautiful and beautiful.
Finally, the camera is compared with the mobile phone. The blur performance is undoubtedly very good, but it is still impossible to surpass the camera. If you want to take good portraits, a good camera with a large aperture lens is still the best choice. If you want to present a perfect out-of-focus blur, mobile phone algorithms cannot do it.
Mobile phone shooting
Camera blur photos, shooting parameters: ISO 400, aperture f/5.6, focal length 105mm, shutter speed 1/200s
For cameras and mobile phones, the advantage of mobile phones is convenience, but mobile phones’ blur Ability is the inherent shortcoming of mobile phones. Algorithms can only be “more alike”, but they can never be “better”. If you want to take portrait photos, it is more appropriate to buy a camera.
Finally, let’s look at a few photos taken with a 90D and 18-135mm lens.
The camera blurs the photo, shooting parameters: ISO 100, aperture f/4.5, focal length 50mm, shutter speed 1/50s
camera blur photos, shooting parameters: ISO 200, aperture f/4.0, focal length 35mm, shutter speed 1/50s
Camera virtual Optimized photos, shooting parameters: ISO 100, aperture f/5.0, focal length 85mm, shutter speed 1/125s
Camera blur photos, shooting parameters: ISO 100, aperture f/5.6, focal length 135mm, shutter speed 1/60s
Camera blur photos , Shooting parameters: ISO 100, aperture f/5.6, focal length 110mm, shutter speed 1/100s
Camera blur photos, shooting parameters: ISO 320, aperture f/5.6, focal length 135mm, shutter speed 1/100s
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