First, I must extend the zoom lens and a fixed lens that is before . In simple terms , it is a blunt zoom lens is a lens that can change focal lengths . ( Zoom out ), the lens is fixed . The zoom lens is not enough ( I need to as I zoom means walking out on their own ) .
The zoom lens is Has improved the quality and are recognized by the photographer more professional . The former is just a cheaper option . For photographers who bought the lens can not fix many of them. Now it is possible that the lens is very sharp . And fastest ( Aperture width ) is a zoom lens .
The zoom lens with better quality . Make the photographer having to carry multiple lenses as before. The zoom lens is a single Fixed lenses can replace two or three of them. ( The current price is more expensive as well , or accidentally fixed lens combination) .
To select the zoom lens . If you can buy a zoom lens aperture remains constant throughout the period. It is better that the aperture changes according to the zoom range . Because the exposure value constant. No change to the example photographers shooting in low light . Then set the aperture to f / 2.8 to get enough shutter speed .If the zoom and aperture change. The shutter speed is OK , perhaps not enough to work. How to solve it is to survive . Assuming that your lens is f / 3.5-5.6 , set at f / 5.6 when zoomed out so it will not be coming . Or a better way is to buy a fixed aperture throughout the range ( a bit expensive, but a good way) .
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