Camera Aperture Explained

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Why does the camera angle wide opening that can not have continued?

Can someone explain what continuous opening? Why what angle camera wide opening that can not have continuous Sorry for not providing enough details! In fact, I'm talking about P & S cameras.

An opening "constant" is a zoom lens with an f-stop (aperture) that does not change as you get close to one another long zoom. The Canon 70-200mm f/2.8L is one example. The f2.8 aperture is maintained at 70 mm to 200 mm. If you look at this aim you see its pretty big. It is also a costly – about $ 1,600.00. From the point you could buy several compact cameras and the cost of this objective its obvious that a simple economy – and size – Make a point and shoot constant aperture zoom lens impossibility.

Camera Exposure Explained Part-1

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