Photographic rectangle

Who says the aperture must be round? In fact, some photographers will make some special shapes, such as a star mask, which is covered in front of the camera to get a star-shaped light cloud background; A circle gives a round light cloud. Because the circle is accepted by most people, the better it is. The reason why photos are made into rectangles is because people look at them horizontally with their eyes, so when analyzing images in their brains, their horizons are wider and their upper and lower horizons are narrower, so it is more natural and comfortable to look at photos with rectangles horizontally. Moreover, the rectangle is convenient for paper opening and cutting; A circle, like a square, looks unnatural, so it is not desirable. 2010-05-2410:12: 46 Supplement: You mean the lens is round. How to turn a circle into a square is actually very simple, as long as the projection of the circular image of the lens is larger than the area of the rectangle and can include the whole area of the rectangle. Of course, the circular projection image of the lens will disappear outside the rectangle, but what does it matter? Of course, your goal will not be these places. The lens glass must be rounded, because the plane is composed of 2D, and the lens surface will affect the refraction of light, that is, it is composed of a curvature, so it must be rounded; Glass must also be round, which can be seen in the manufacture of glasses lenses. The raw materials of lenses are all round, and the customers will polish the lenses with suitable shapes after choosing the frames.

Although the lens is round

But cmos/ccd is rectangular, and the circle is bigger than the rectangle, so the image is round.

Reference: myself

The aperture is projected like a pistol, and there is a lens in it instead of light, which seems to scan down.

And the photo is from the negative ~ if you want the photo to be round.

Try to shoot the light down with a round mirror.

Maybe it turns out that circular photos look strange ~ there is a basic knowledge that you need to learn microscope.

Put the paper with the letter "F" on it under the microscope.

See if the steering is different? .