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Have you ever noticed anything interesting about cameras, though? What size is the camera lens? What figure do they draw? This is right! Round lenses make rectangular images! what's up with that?
This curiosity about cameras stems from the fact that the camera lens does not directly produce the image. Instead, the lens works together with another key part of the camera to produce the picture. In older cameras, that other key element is called film. In newer digital cameras, this is known as image sensor.
As the object on which you are photographing, the light goes off, that light enters through the camera lens. The lens's job is to bend that light and focus it on a film or image sensor.
Early camera makers quickly discovered that round lenses did the most efficient job of focusing light on film. Can a lens be made in a different shape, such as a rectangle? Of course, lenses can be made in any size, but camera pioneers discovered early in that period that the best images were made on film.
Then what about the film? If the camera lens was round, then why was a rectangular film made? Early camera makers decided to film rectangles for a few reasons.
One reason for this is common knowledge, if you think about it. Think of all the pictures you see, whether they are pictures, pictures, or posters. What size are they Most of them are rectangular or square. Why is this?
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If you think about displaying pictures, we usually display them on walls, which are in shape? You got it: rectangular or square. Rectangular or square shapes are very easy to use when it comes to framing and displaying photos, as frames are easy to make and they are easy to display on walls of the same size.
So it is only natural that
camera makers would not think of making films that would make rectangular photographs. However, in practice, there was another reason. If you have ever seen a film with an old camera, you know that it comes in a long strip, which is displayed as pictures. It is more straightforward to use a rectangular film in a camera rather than a series of oval or some other shape.
Similarly, modern image sensors in today's digital cameras maintain a rectangular shape. In addition to maintaining the traditional shape of the film, using a rectangular sensor also produces better images.
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A round
camera lens produces a round image inside the camera. However, the outer edges of the round image will have more distortions, sometimes called aberrations, closer to the center than parts of the image. The reason for this is that the light must bend more to reach the outer edges of the spherical image.
To correct for these plagues and end up with the best image possible, the rectangular sensor ejects the outer edges of the circular image from the lens. In other words, it only keeps the best part of the image from the lens. If you keep a full circular image with the lens, it gives you better pictures.
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