Comparing Human Eyes to Camera | Things that affect Photoshooting

  1. Focus
    Human eye operates by scanning a complete scene in their field of vision, correcting the focus automatically at ever point. The image seen by the eyes is sent to the brain to do the instantaneous focus correction. Human eye function instantaneously, it monitors and adjust the focus constantly and responding to very subtle changes in the volume of light present.
    There is however a slight time lag for camera, even a DSLR with really good autofocus system will usually takes some time for the autofocus mechanism to be complete. And we would still have to decide on the point of focus.

  2. Speed
    Human eye operates at relative constant speed of roughly around 1/60 second whereas a lot of cameras can go a lot faster than that. Most DSLR could go up to 1/8000 or even faster. Of course, what we see at 1/60 second is not going to be the same as what is captured by camera at 1/8000 second. All motion that could be seen at 1/60 second would appear arrested at 1/8000 second. In a way, camera see things in a way that human eye physically could not see.

  3. Image Sharpness
    Human eye can see everything that is eight inches outwards sharply. Farther away, every object within the range of vision will still appear sharply focus. In other words, human eyes has virtually unlimited depth of field.
    Camera however is not so flexible in displaying wide range of sharply focus image. The depth of field of camera is restricted by the focal length of the camera lens, distance of the subject to the camera, aperture of the camera lens, etc. Try using a 50mm camera lens on a full frame 35mm camera, f/8 aperture size to focus on subjects that is 10 feet away and you will find that only objects that is one foot in front and behind the subject that is sharply focused. Of course, many photographers strive for very shallow depth of field as the rightly focused subject would appear stand out compare to the surrounding objects that is blurred.

  4. Dimension
    Our brain interprets what our eyes see and translate into true 3-D images with unlimited depth of view. Camera’s depth of field is however limited and controlled by the aperture size of the camera lens, distance of the subject from the camera and focal length of the camera lens.

  5. Brightness Range
    Human eyes are capable of seeing a greater range of tones from dark to bright condition, as human eyes has a contrast range of 1000:1 or even more.
    Camera on the other hand depends on the sensor or the film which usually has the contrast range of 100:1. Thus, we need to be aware that what we can see with our human eye is not what we can get with our camera, a lot of details in the dark or bright places would not be captured when taken together.

  6. Angle of View
    Human eye has a very limited visual view of around 20 degrees, which cover 10 degrees on each side of the optical view. This is where human eye can see very fine details and focus correctly. Of course there is also the peripheral vision which would provide us with almost 180 degree of vision, but with peripheral vision, the image seen would not be accurate and could not be identify correctly. Peripheral vision basically just to allow us to “sense” objects in a wider vision view.
    For camera, the angle of view is fixed and decided by the focal length of the camera lenses and the camera format. A 50mm lens on a full frame 35mm format camera would encompasses around 46 degree whereas a 25mm lens on the 35mm format camera would encompass around 84 degrees. Zoom lens would cover a wide range of angle of view but it would still be one at a time and the zooming effects is done manually compare to the automation of human eye.

  7. Color Rendition
    Our brain interprets what we see from our eyes; it translates the color of the subject and let us knows what the right color is. Our brain also does correction under different lighting environment so that things like skin tones would appear normal even when under extreme lighting environment. Normally we would be able to see seven distinct color involving red, blue, yellow, green, white, black and gray. Although, there are people that is color blind and might not be able to see certain colors.
    Camera however, usually has its own color bias, depending on model. Different model of camera has its own setting of color bias, some are slightly yellowish, some are predominate in blues, greens, etc. Camera lenses also have some effect on color rendition as different models of camera lens would detect different color rendition. That’s the reason why that a same scenes captured with different camera and camera lens will appear different, especially in color.

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