You know what? We’re going to start off this little discussion with an analogy to try and make things a little easier. I want you to think of your camera as if it was a third eye – because at the end of the day, that’s really all it is. Just a little man-made mechanical facsimile…
Unless you are endowed with some super-human abilities, your eye needs light to see things. And your eye has a lens (that clear part on the front) through which the light passes and is absorbed by a little area on the back of your eyeball that senses the different colors of light. Well, guess what? That is exactly how a camera works! Light comes in through the glass and is sensed by the “sensor” inside the camera.
Now, if you bought a cheap little pocket camera your third eye has a relatively small, dirty lens (cheap glass), and a tiny little sensor. If you bought a big camera, you’ve got a high quality, extremely clear lens and a large sensor. But either way, the more light you allow to enter the sensor, the sharper your photos are going to turn out and the smaller the file sizes will actually be!
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waterproof camcorder to determine if it was going to be a workable solution for snorkeling around a coral reef on an upcoming trip to Hawaii. 
Have you ever been at the bookstore browsing through a magazine and thought “I need to remember this article, but I don’t want to buy the magazine”? Well, in that case whip out your cell phone and snap a photo of the page.
