08 Jun

Eyesight experiments for photographers

Disclaimer.
We did not test security of our experiments for health and are not responsible for any possible consequences from their repetition.

Our eyesight is similar to photocamera. We have done some interesting experiments,
that demonstrate this.

1. Photographing by eyes.

Screenshot from 2017-05-29 13-21-19
We need any camera flash for our first test. Best of all – external camera flash
but built-in camera or mobile phone flash is also suitable. Find completely dark room,
for example bathroom, and in full darkness highlight objects (that are in front of us) by flash.

A moment later our visual memory will show us highlighted area and it looks like we are looking on photo. Perhaps you should try for several times. Be patient.

2. Depth of field

Screenshot from 2017-05-29 13-22-24
To increase the depth of field photographers decrease aperture. Our eye also has “aperture” – pupil. Let’s check, whether it works or not. Take a sheet of paper and write on it something in tiny handwriting. Make twilight and look on inscription by one eye. Get closer to paper so, that you are not able to read the text and now turn on the light. Pupil become smaller, depth of field increases and now it is easier for eye to focus.
If you haven’t a lamp, you can imitate decreasing of the pupil. Make a small gap, benting index finger. This method works if look on close or distant objects.

 3. Photosensitivity

Screenshot from 2017-05-29 13-23-23
But not only pupil reacts on light levels. We have analogue of sensitivity like in the camera. Long time ago sailors wore a bandage over one eye (to make it adapt to the darkness) When a sailor went to the dark ship’s hold, he took off the bandage and immediately could see.
Let’s try. Close one eye by your hand, and the second one leave opened. Wait at least a minute in bright room, and then look in dark room or in cupboard. Then open your eyes by rotation. The eye, accustomed to the darkness, will for some time see brighter.

 4. White balance.

Screenshot from 2017-05-29 13-24-26
Have you ever tried to walk in the colored glasses, and then remove them? As you might notice the colors change. Our eyes gradually adapts to the lighting conditions and corrects color. Photocamera also has such a setting, it is called “white balance.”
Let’s check how “white balance of our eyes” works. Let’s look by one eye for a minute on the book, highlighted by yellow light. Then open your eyes by rotation.
For a while,  your eyes will perceive colors differently.

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