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Lens Resolution & Not Pixels Make the Difference in Camera : Unknown Facts


By : Umarani Nannapuraju | Category : Technology | Last Updated : 2018-05-16





Browsing the net, games, camera, apps etc., are increasing the use of smartphones. Notably, the camera has become the most wanted tool on the smartphone. Taking selfies, photos, and videos and sharing them with friends on social media has become a hobby. That is why, phones that have prominent camera features, are popular.

Selfie-craze has increased to a large extent in our country. That is why companies are coming out with latest models, highlighting the cameras. There are many things to learn about smartphone camera, that is so important. Normally, people think that a camera with more pixels is superb. It is wrong. Despite the number of pixels, if a picture has to be of good quality, there are other important features.

Several smartphone companies are highlighting camera pixels. They are advertising in bold letters about 18 megapixels and 23 megapixels. These figures look attractive. But nothing is revealed about the camera lens. Phone companies procure camera sensors and lens separately and fix them on the phone. When compared with the lens, camera sensors are very cheap. Because of this, the companies fix sensors with high resolution, to a low-resolution lens, to save on costs. The quality of the pictures suffers, due to the low-resolution lens, despite high-resolution camera. As a result, the resolution of the actual photo is less.


Resolution -



Representational image. This is very essential in digital photography. It reveals the competence of the camera. It impacts the clarity of the picture. For example, let us say you are taking a picture of a park. It is useful only if every blade of grass, plants, leaves, and flowers are absolutely clear. For this, a good quality camera is needed.

Also, the number of pixels in a scene is mentioned in the resolution. The resolution of an image is equal to the multiple of its height and width. Supposing an image is 2,048 pixels wide and 1,536 pixels high. The multiple of these two is 31,45,728. We should understand that the picture has that many pixels. This is equal to 3.1 megapixels. One megapixel is equal to 10 lakh pixels. This image can also be described as taken in 2048x1536 resolution.

If the megapixels are more, the image can be shot in a larger size. Pixel Per Inch (PPI) is the number of pixels in an inch. This is mentioned in the specifications of the screen of a smartphone. Megapixel indicates the rating or quality of a picture. A room can easily accommodate 10 people. But if 50 or 100 more barges in, they would be suffocated. Similarly, if more megapixels are fixed close to each other on a camera sensor, the quality of the picture is affected. That is why pictures taken with a budget phone camera are blurred. That is why experts look for lens and sensors, rather than megapixels.


Lens & sensors -



Representational image. The most important factor in a lens is its diameter. If all other aspects of the lens are intact but the diameter is small, it affects the image. The diameter of the lens can limit the scope of the resolution. The amount of light the lens can gather depends on its diameter. If the lens is big and has high resolution, it gathers more light. Digital cameras have the lens that is 10 mm to 50 mm wide. Still wider lens too are available. Smartphone camera lens is small. These are just 2 mm in diameter. Despite this lack, smartphone camera sensors have high resolution.

For example, you imagine that with a 20-megapixel phone camera, you can take a very clear picture. But for this, just the number of megapixels is not sufficient. The diameter of the lens should be big.


Why are photos of moving objects not clear?

Representational image. Many might have observed that shooting a fast moving object is tough and the image is not clear. That is because Complementary Metal-oxide Semiconductor (CMOS) sensors are being used in phone cameras. These sensors capture the pictures one line after another. But expensive Charge-Coupled-Device (CCD) image sensors capture the whole picture at one time. Still, images appear the same in both the sensors.


ISO settings -



Representational image. Those who wish to take good pictures should surely check out IOS option in camera settings. This determines the camera sensitivity. Photo quality is reduced when the lighting is less or when clouds hover and the environment turns dark. For example, when you take a picture while cycling, the image is a blur. But if you change to auto mode in IOS option in camera settings, and then take a picture, it is different. The IOS should be switched off after clicking and before viewing the picture. You can notice the difference. If IOS is low, more light is necessary.

The shutter speed has to be reduced. Normally, in good light, shutter speed is set at 100 to 200. But if more light is not needed and shutter speed has to be slowed down, reduce the IOS.


Shutter speed -



This is also called exposure time. It aids in capturing the light by opening the shutter. For example, you see Dolphins diving in the sea at great speed. For shooting this, the shutter speed has to be high. If it is low, the picture is blurred


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