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Now - my aperture said 4.5. I have no idea what this is. Just thought I'd throw that out there in case you wanted to explain that as well.
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Lets go back to film for a moment. You know that the surface of the negative strip was treated with chemicals and "stuff" that was highly sensitive to light. The more light that it was exposed to the more it reacted. When it was exposed to just the right amount of light it would recreate the scene.
If you turned your camera around and looked into the lens and snapped a picture with a very slow shutter speed you might get a glimpse of what looks like a black curtain that can open in the center and appear as a circle hole (aperture). The camera has the ability to vary the size of the hole opening. The larger the opening the more light will come in to expose the film (chip). The other moderating factor would be how long the hole was allowed to remain open (shutter speed). The combination of the size of the hole (aperture), and duration (shutter speed) will make up the "EXPOSURE."
Aperture is expressed in these terms: 2.8, 4.5, 5.6, 8, 11, 16, 22 and numbers like that (I may have missed one). These numbers represent different size holes (apertures).To further confuse us they are also refered to as stops or f-stops. Shutter speeds are expressed in fractions of a second: 1/30, 1/250, 1/1000 etc.
Imagine how many combinations can be produced with just these two variables.
The camera magically combines the proper aperture and the proper SS to get the perfect(?) exposure. It's just an amazing thing to me that this gadget can be pointed at something and reproduce the image so well.