The Zoom All-In-One A Few Words
The Zoom All-in-one, those ranging from wide angle to medium telephoto, are very versatile instruments. These provide a wide range of focal lengths in a single compact device, a boon for those who need to reduce the weight and bulk of the equipment.
With focal lengths from 28mm to 200mm (sometimes more), you can capture a scene exactly as you want, without having to change lenses or move closer or farther to the subject. This can mean the difference between catching a fleeting moment and its loss due to the frantic exchange of lenses akusewa, without forgetting the most direct effect on our camera: fewer changes lenses also means less chance that dust from entering in the machine and not stick to the sensor.
Many zoom all-in-one also have the option of a focus very short and therefore of subjects closer to the lens itself and are capable of producing images in which the subject is great 1/4 or even 1/3 on the floor image, an excellent solution for photos of flowers and insects. Obviously we are not in the presence of true macro lenses (remember that macro lenses produce images where the size ratio is 1: 1), but it adds versatility to the lens.
The larger all-in-one (those with a zoom ratio of 7: 1 or higher) are relatively inexpensive, certainly much less of a series of fixed focal length lenses or zoom-end pro short range they can cover the same range of focal lengths. Also, if you frequently use the filters, use a “superzoom” instead of many targets we can save a lot of money (if we change objective, we will probably have to change the filter).
What’s wrong with the zoom all-in-one?
For starters, the zoom all-in-one are not quite as clear as the short-range zoom or fixed focal length lenses. This is because each focal length has its particular aberration, distortion and vignetting that must be resolved or reduced, and you can not correct them completely all for a wide range of focal lengths in one lens (orrezioni that help short focal lengths can worsen images at longer focal lengths, for example). In short, a zoom lens at large radius is a compromise in terms of optical performance.
This does not mean you zoom all-in-one are not good, it’s just that they are not as good at a given focal length as a prime lens or a lens that has a focal length shorter and covers the focal length we are interested. In any case, going to choose the objectives more technological (computer designed, with low dispersion lens and aspherical elements), you can get good performance over the entire focal range, even if it means going to spend a figure quite interesting .