Tuesday, June 24, 2008

Zoom lenses

Here we have a range of zoom lenses. Compared with prime lenses, they are much heavier and bulkier (and dearer!) but the zoom function really makes each one the equivalent of a number of prime lenses. Modern computerised optics have made the resolution of the top-end zooms every bit as good as that of prime lenses. But there is still a trade-off with the zoom lenses that cover an extra-large range of focal lengths - it is still quite difficult to obtain top image quality with these lenses.

The lenses here are 70-200mm f2.8, 18-200mm f3.5, 24-70mm f2.8 and 14-24mm f2.8. They really fall into two categories - firstly, the 18-200mm zoom is really a one-lens solution for those times when you want to carry the least amount of gear with you; what is generally called a "walk-around lens". It will cover most photographic situations reasonably well, but you can not expect the very best image quality at all focal lengths. The three other lenses cover approximately
the same total focal lengths as the 18-200mm, but do give better resolution. Obviously, you are carrying more weight and would be involved in changing the lens on the camera if you chose to carry these with you instead of the 18-200mm. However, if you are aware in advance of the photographic circumstances, you may not need to carry them all with you.


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