On DPS By: Anne McKinnell
Do you ever see a beautiful scene, take out your camera, take the shot and then wonder what went wrong? Why doesn’t the display on the LCD screen look at all like the scene in front of you?
Do you ever stand next to another photographer and wonder how they made an image that is better than the scene you see with your own eyes?
Understanding how the camera “sees” is the key to figuring out why this happens and what you need to do to take charge of your camera and make the images you envision.
If you’re already dreading the mathematical calculations, don’t worry! I’m not going to start measuring my eyeballs and pupils and trying to figure out what kind of lens my eyes are equivalent to in focal length, f/stops, and ISO, or how many megapixels my eyes see. That’s not what this is about.
It’s just about understanding how a camera works differently than our eyes.
When the camera’s “eye” is better than our own
Sometimes the best images show the very thing that we cannot see with our own eyes.
Low Light Levels At low light levels our eyes are less sensitive to colour than normal. Camera sensors, on the other hand, always have the same sensitivity. That’s why photographs taken in low light appear to have more colour than what we remember.
Depth of Field
One thing that is somewhat similar between a camera and a human eye is aperture, but only if you hold it steady. For example, if you stare at one word in the middle of the this sentence and do not move your eyes, you can perceive that the other words are there but they are not clear. The part that is in focus is only the centre portion of your field of view.
That is the same as a camera with a small aperture. The difference is that you can’t actually look at the out-of-focus part. As soon as your eye moves to the out-of-focus words they instantly become in-focus.
Whereas if you are looking at a print or an image on your screen you can look at the out-of-focus part which is something we cannot do with our eyes. That’s why shallow depth of field images are so interesting to us.
see the whole article here and understand what you see is not always what you get